2156621205232 has 40 divisors (see below), whose sum is σ = 4764571516656. Its totient is φ = 936812829696.

The previous prime is 2156621205157. The next prime is 2156621205281. The reversal of 2156621205232 is 2325021266512.

It is a junction number, because it is equal to n+sod(n) for n = 2156621205191 and 2156621205200.

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, 304948558 + ... + 304955629.

Almost surely, 2^{2156621205232} is an apocalyptic number.

It is an amenable number.

2156621205232 is an abundant number, since it is smaller than the sum of its proper divisors (2607950311424).

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

2156621205232 is a wasteful number, since it uses less digits than its factorization.

2156621205232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 609904225 (or 609904219 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 37.

The spelling of 2156621205232 in words is "two trillion, one hundred fifty-six billion, six hundred twenty-one million, two hundred five thousand, two hundred thirty-two".