21256030426036 has 48 divisors (see below), whose sum is σ = 42606070398976. Its totient is φ = 9089584457184.

The previous prime is 21256030426019. The next prime is 21256030426067. The reversal of 21256030426036 is 63062403065212.

It is a self number, because there is not a number n which added to its sum of digits gives 21256030426036.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 394428685 + ... + 394482571.

Almost surely, 2^{21256030426036} is an apocalyptic number.

It is an amenable number.

21256030426036 is an abundant number, since it is smaller than the sum of its proper divisors (21350039972940).

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

21256030426036 is a wasteful number, since it uses less digits than its factorization.

21256030426036 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84788 (or 84786 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 40.

The spelling of 21256030426036 in words is "twenty-one trillion, two hundred fifty-six billion, thirty million, four hundred twenty-six thousand, thirty-six".