21116010324656 has 40 divisors (see below), whose sum is σ = 45480637636224. Its totient is φ = 9431468628480.

The previous prime is 21116010324649. The next prime is 21116010324691. The reversal of 21116010324656 is 65642301061112.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1637401301 + ... + 1637414196.

Almost surely, 2^{21116010324656} is an apocalyptic number.

21116010324656 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

21116010324656 is an abundant number, since it is smaller than the sum of its proper divisors (24364627311568).

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

21116010324656 is a wasteful number, since it uses less digits than its factorization.

21116010324656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3274815549 (or 3274815543 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 38.

Adding to 21116010324656 its reverse (65642301061112), we get a palindrome (86758311385768).

The spelling of 21116010324656 in words is "twenty-one trillion, one hundred sixteen billion, ten million, three hundred twenty-four thousand, six hundred fifty-six".