21113612 has 24 divisors (see below), whose sum is σ = 40038096. Its totient is φ = 9684288.

The previous prime is 21113611. The next prime is 21113629. The reversal of 21113612 is 21631112.

It is a super-2 number, since 2×21113612² = 891569223373088, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21113611) 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, 7823 + ... + 10169.

It is an arithmetic number, because the mean of its divisors is an integer number (1668254).

Almost surely, 2^21113612 is an apocalyptic number.

It is an amenable number.

21113612 is a deficient number, since it is larger than the sum of its proper divisors (18924484).

21113612 is a wasteful number, since it uses less digits than its factorization.

21113612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2537 (or 2535 counting only the distinct ones).

The product of its digits is 72, while the sum is 17.

The square root of 21113612 is about 4594.9550596279. The cubic root of 21113612 is about 276.3890578400.

Adding to 21113612 its reverse (21631112), we get a palindrome (42744724).

The spelling of 21113612 in words is "twenty-one million, one hundred thirteen thousand, six hundred twelve".