21051044 has 12 divisors (see below), whose sum is σ = 42102144. Its totient is φ = 9021864.

The previous prime is 21051029. The next prime is 21051047. The reversal of 21051044 is 44015012.

21051044 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (21051047) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 375884 + ... + 375939.

It is an arithmetic number, because the mean of its divisors is an integer number (3508512).

Almost surely, 2^21051044 is an apocalyptic number.

It is an amenable number.

21051044 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21051044 is a wasteful number, since it uses less digits than its factorization.

21051044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 751834 (or 751832 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 17.

The square root of 21051044 is about 4588.1416717447. The cubic root of 21051044 is about 276.1157709376.

Adding to 21051044 its reverse (44015012), we get a palindrome (65066056).

The spelling of 21051044 in words is "twenty-one million, fifty-one thousand, forty-four".