21101044 has 12 divisors (see below), whose sum is σ = 36979264. Its totient is φ = 10535544.

The previous prime is 21101033. The next prime is 21101123. The reversal of 21101044 is 44010112.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 204 + ... + 6499.

Almost surely, 2^21101044 is an apocalyptic number.

It is an amenable number.

21101044 is a deficient number, since it is larger than the sum of its proper divisors (15878220).

21101044 is a wasteful number, since it uses less digits than its factorization.

21101044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7494 (or 7492 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

The square root of 21101044 is about 4593.5872692265. The cubic root of 21101044 is about 276.3342062251.

Adding to 21101044 its reverse (44010112), we get a palindrome (65111156).

The spelling of 21101044 in words is "twenty-one million, one hundred one thousand, forty-four".