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21122774 = 210561387
BaseRepresentation
bin101000010010…
…0111011010110
31110202010222222
41100210323112
520401412044
62032422342
7344353301
oct120447326
943663888
1021122774
1110a17942
1270a79b2
1344b74aa
142b3bb38
151cc38ee
hex1424ed6

21122774 has 4 divisors (see below), whose sum is σ = 31684164. Its totient is φ = 10561386.

The previous prime is 21122743. The next prime is 21122821. The reversal of 21122774 is 47722112.

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 polite number, since it can be written as a sum of consecutive naturals, namely, 5280692 + ... + 5280695.

It is an arithmetic number, because the mean of its divisors is an integer number (7921041).

Almost surely, 221122774 is an apocalyptic number.

21122774 is a deficient number, since it is larger than the sum of its proper divisors (10561390).

21122774 is a wasteful number, since it uses less digits than its factorization.

21122774 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10561389.

The product of its digits is 1568, while the sum is 26.

The square root of 21122774 is about 4595.9519144569. The cubic root of 21122774 is about 276.4290306366.

Adding to 21122774 its reverse (47722112), we get a palindrome (68844886).

The spelling of 21122774 in words is "twenty-one million, one hundred twenty-two thousand, seven hundred seventy-four".

Divisors: 1 2 10561387 21122774