21623640706256 has 40 divisors (see below), whose sum is σ = 43250566619904. Its totient is φ = 10462257146880.

The previous prime is 21623640706243. The next prime is 21623640706273. The reversal of 21623640706256 is 65260704632612.

It is a congruent number.

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, 4906391 + ... + 8204873.

Almost surely, 2^{21623640706256} is an apocalyptic number.

It is an amenable number.

21623640706256 is an abundant number, since it is smaller than the sum of its proper divisors (21626925913648).

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

21623640706256 is a wasteful number, since it uses less digits than its factorization.

21623640706256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3311739 (or 3311733 counting only the distinct ones).

The product of its (nonzero) digits is 4354560, while the sum is 50.

The spelling of 21623640706256 in words is "twenty-one trillion, six hundred twenty-three billion, six hundred forty million, seven hundred six thousand, two hundred fifty-six".