21102044 has 24 divisors (see below), whose sum is σ = 38064768. Its totient is φ = 10229760.

The previous prime is 21102023. The next prime is 21102047. The reversal of 21102044 is 44020112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21102047) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36284 + ... + 36860.

It is an arithmetic number, because the mean of its divisors is an integer number (1586032).

Almost surely, 2^21102044 is an apocalyptic number.

It is an amenable number.

21102044 is a deficient number, since it is larger than the sum of its proper divisors (16962724).

21102044 is a wasteful number, since it uses less digits than its factorization.

21102044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 845 (or 843 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 14.

The square root of 21102044 is about 4593.6961153302. The cubic root of 21102044 is about 276.3385714094.

Adding to 21102044 its reverse (44020112), we get a palindrome (65122156).

The spelling of 21102044 in words is "twenty-one million, one hundred two thousand, forty-four".