21734502556656 has 20 divisors (see below), whose sum is σ = 56147464938152. Its totient is φ = 7244834185536.

The previous prime is 21734502556651. The next prime is 21734502556691. The reversal of 21734502556656 is 65665520543712.

It is a happy number.

It is a hoax number, since the sum of its digits (57) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 21734502556596 and 21734502556605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21734502556651) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 226401068251 + ... + 226401068346.

Almost surely, 2^{21734502556656} is an apocalyptic number.

It is an amenable number.

21734502556656 is an abundant number, since it is smaller than the sum of its proper divisors (34412962381496).

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

21734502556656 is a wasteful number, since it uses less digits than its factorization.

21734502556656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 452802136608 (or 452802136602 counting only the distinct ones).

The product of its (nonzero) digits is 45360000, while the sum is 57.

The spelling of 21734502556656 in words is "twenty-one trillion, seven hundred thirty-four billion, five hundred two million, five hundred fifty-six thousand, six hundred fifty-six".