21031044 has 24 divisors (see below), whose sum is σ = 49284480. Its totient is φ = 6980064.

The previous prime is 21031033. The next prime is 21031063. The reversal of 21031044 is 44013012.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 799 + ... + 6534.

It is an arithmetic number, because the mean of its divisors is an integer number (2053520).

Almost surely, 2^21031044 is an apocalyptic number.

It is an amenable number.

21031044 is an abundant number, since it is smaller than the sum of its proper divisors (28253436).

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

21031044 is a wasteful number, since it uses less digits than its factorization.

21031044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7579 (or 7577 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 21031044 is about 4585.9616221682. The cubic root of 21031044 is about 276.0282999757.

Adding to 21031044 its reverse (44013012), we get a palindrome (65044056).

The spelling of 21031044 in words is "twenty-one million, thirty-one thousand, forty-four".