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21161740 = 22541131197
BaseRepresentation
bin101000010111…
…0011100001100
31110211010110011
41100232130030
520404133430
62033323004
7344605015
oct120563414
943733404
1021161740
1110a44146
127106464
1344cc152
142b4c00c
151cd022a
hex142e70c

21161740 has 48 divisors (see below), whose sum is σ = 46103904. Its totient is φ = 8153600.

The previous prime is 21161737. The next prime is 21161761. The reversal of 21161740 is 4716112.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 107322 + ... + 107518.

It is an arithmetic number, because the mean of its divisors is an integer number (960498).

Almost surely, 221161740 is an apocalyptic number.

21161740 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21161740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23051952).

21161740 is an abundant number, since it is smaller than the sum of its proper divisors (24942164).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21161740 is a wasteful number, since it uses less digits than its factorization.

21161740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 378 (or 376 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 22.

The square root of 21161740 is about 4600.1891265469. The cubic root of 21161740 is about 276.5989060036.

Adding to 21161740 its reverse (4716112), we get a palindrome (25877852).

The spelling of 21161740 in words is "twenty-one million, one hundred sixty-one thousand, seven hundred forty".

Divisors: 1 2 4 5 10 20 41 82 131 164 197 205 262 394 410 524 655 788 820 985 1310 1970 2620 3940 5371 8077 10742 16154 21484 25807 26855 32308 40385 51614 53710 80770 103228 107420 129035 161540 258070 516140 1058087 2116174 4232348 5290435 10580870 21161740