2156921802 has 48 divisors (see below), whose sum is σ = 5414136000. Its totient is φ = 607818816.

The previous prime is 2156921783. The next prime is 2156921843. The reversal of 2156921802 is 2081296512.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 108052 + ... + 126447.

It is an arithmetic number, because the mean of its divisors is an integer number (112794500).

Almost surely, 2^2156921802 is an apocalyptic number.

2156921802 is an abundant number, since it is smaller than the sum of its proper divisors (3257214198).

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

2156921802 is a wasteful number, since it uses less digits than its factorization.

2156921802 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 234587 (or 234584 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 36.

The square root of 2156921802 is about 46442.6722099407. The cubic root of 2156921802 is about 1292.0464687092.

The spelling of 2156921802 in words is "two billion, one hundred fifty-six million, nine hundred twenty-one thousand, eight hundred two".