2157929931171 has 96 divisors (see below), whose sum is σ = 3497342822400. Its totient is φ = 1158852614400.

The previous prime is 2157929931139. The next prime is 2157929931191. The reversal of 2157929931171 is 1711399297512.

It is not a de Polignac number, because 2157929931171 - 2⁵ = 2157929931139 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2157929931191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 97241145 + ... + 97263333.

It is an arithmetic number, because the mean of its divisors is an integer number (36430654400).

Almost surely, 2^{2157929931171} is an apocalyptic number.

2157929931171 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

2157929931171 is a deficient number, since it is larger than the sum of its proper divisors (1339412891229).

2157929931171 is a wasteful number, since it uses less digits than its factorization.

2157929931171 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22401 (or 22370 counting only the distinct ones).

The product of its digits is 2143260, while the sum is 57.

The spelling of 2157929931171 in words is "two trillion, one hundred fifty-seven billion, nine hundred twenty-nine million, nine hundred thirty-one thousand, one hundred seventy-one".