21113044 has 12 divisors (see below), whose sum is σ = 38222100. Its totient is φ = 10192448.

The previous prime is 21113041. The next prime is 21113069. The reversal of 21113044 is 44031112.

It can be written as a sum of positive squares in 2 ways, for example, as 12040900 + 9072144 = 3470^2 + 3012^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21113041) 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, 90889 + ... + 91120.

It is an arithmetic number, because the mean of its divisors is an integer number (3185175).

Almost surely, 2^21113044 is an apocalyptic number.

It is an amenable number.

21113044 is a deficient number, since it is larger than the sum of its proper divisors (17109056).

21113044 is a wasteful number, since it uses less digits than its factorization.

21113044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 182042 (or 182040 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 21113044 is about 4594.8932522965. The cubic root of 21113044 is about 276.3865793379.

Adding to 21113044 its reverse (44031112), we get a palindrome (65144156).

The spelling of 21113044 in words is "twenty-one million, one hundred thirteen thousand, forty-four".