21011612 has 12 divisors (see below), whose sum is σ = 36802416. Its totient is φ = 10496640.

The previous prime is 21011579. The next prime is 21011621. The reversal of 21011612 is 21611012.

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, 7937 + ... + 10247.

It is an arithmetic number, because the mean of its divisors is an integer number (3066868).

Almost surely, 2^21011612 is an apocalyptic number.

It is an amenable number.

21011612 is a deficient number, since it is larger than the sum of its proper divisors (15790804).

21011612 is a wasteful number, since it uses less digits than its factorization.

21011612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4588 (or 4586 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 14.

The square root of 21011612 is about 4583.8424929310. The cubic root of 21011612 is about 275.9432600579.

Adding to 21011612 its reverse (21611012), we get a palindrome (42622624).

The spelling of 21011612 in words is "twenty-one million, eleven thousand, six hundred twelve".