21214036500656 has 20 divisors (see below), whose sum is σ = 42889247708592. Its totient is φ = 10145843543616.

The previous prime is 21214036500649. The next prime is 21214036500661. The reversal of 21214036500656 is 65600563041212.

It is a happy 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, 28823418791 + ... + 28823419526.

Almost surely, 2^{21214036500656} is an apocalyptic number.

It is an amenable number.

21214036500656 is an abundant number, since it is smaller than the sum of its proper divisors (21675211207936).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21214036500656 is a wasteful number, since it uses less digits than its factorization.

21214036500656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57646838348 (or 57646838342 counting only the distinct ones).

The product of its (nonzero) digits is 259200, while the sum is 41.

Adding to 21214036500656 its reverse (65600563041212), we get a palindrome (86814599541868).

The spelling of 21214036500656 in words is "twenty-one trillion, two hundred fourteen billion, thirty-six million, five hundred thousand, six hundred fifty-six".