21056116414456 has 16 divisors (see below), whose sum is σ = 39527842195800. Its totient is φ = 10515358495584.

The previous prime is 21056116414453. The next prime is 21056116414469. The reversal of 21056116414456 is 65441461165012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21056116414453) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1587456910 + ... + 1587470173.

Almost surely, 2^{21056116414456} is an apocalyptic number.

It is an amenable number.

21056116414456 is a deficient number, since it is larger than the sum of its proper divisors (18471725781344).

21056116414456 is a wasteful number, since it uses less digits than its factorization.

21056116414456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3174927918 (or 3174927914 counting only the distinct ones).

The product of its (nonzero) digits is 691200, while the sum is 46.

Adding to 21056116414456 its reverse (65441461165012), we get a palindrome (86497577579468).

The spelling of 21056116414456 in words is "twenty-one trillion, fifty-six billion, one hundred sixteen million, four hundred fourteen thousand, four hundred fifty-six".