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21161542 = 210580771
BaseRepresentation
bin101000010111…
…0011001000110
31110211010011211
41100232121012
520404132132
62033322034
7344604313
oct120563106
943733154
1021161542
1110a43a86
12710631a
1344cc02c
142b4bd0a
151cd0147
hex142e646

21161542 has 4 divisors (see below), whose sum is σ = 31742316. Its totient is φ = 10580770.

The previous prime is 21161537. The next prime is 21161551. The reversal of 21161542 is 24516112.

It is a semiprime because it is the product of two primes.

It is a congruent number.

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 as a sum of consecutive naturals, namely, 5290384 + ... + 5290387.

It is an arithmetic number, because the mean of its divisors is an integer number (7935579).

Almost surely, 221161542 is an apocalyptic number.

21161542 is a deficient number, since it is larger than the sum of its proper divisors (10580774).

21161542 is a wasteful number, since it uses less digits than its factorization.

21161542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10580773.

The product of its digits is 480, while the sum is 22.

The square root of 21161542 is about 4600.1676056422. The cubic root of 21161542 is about 276.5980433342.

Adding to 21161542 its reverse (24516112), we get a palindrome (45677654).

The spelling of 21161542 in words is "twenty-one million, one hundred sixty-one thousand, five hundred forty-two".

Divisors: 1 2 10580771 21161542