2156731021876 has 24 divisors (see below), whose sum is σ = 3779309406600. Its totient is φ = 1076928548352.

The previous prime is 2156731021801. The next prime is 2156731021889. The reversal of 2156731021876 is 6781201376512.

It can be written as a sum of positive squares in 4 ways, for example, as 276612883600 + 1880118138276 = 525940^2 + 1371174^2 .

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, 70353400 + ... + 70384048.

It is an arithmetic number, because the mean of its divisors is an integer number (157471225275).

Almost surely, 2^{2156731021876} is an apocalyptic number.

It is an amenable number.

2156731021876 is a deficient number, since it is larger than the sum of its proper divisors (1622578384724).

2156731021876 is a wasteful number, since it uses less digits than its factorization.

2156731021876 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53523 (or 53521 counting only the distinct ones).

The product of its (nonzero) digits is 846720, while the sum is 49.

The spelling of 2156731021876 in words is "two trillion, one hundred fifty-six billion, seven hundred thirty-one million, twenty-one thousand, eight hundred seventy-six".