321139881 has 48 divisors (see below), whose sum is σ = 521664000. Its totient is φ = 189423360.

The previous prime is 321139873. The next prime is 321139927. The reversal of 321139881 is 188931123.

It is not a de Polignac number, because 321139881 - 2³ = 321139873 is a prime.

It is a super-2 number, since 2×321139881² = 206261646337388322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (321139681) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 152685 + ... + 154773.

It is an arithmetic number, because the mean of its divisors is an integer number (10868000).

Almost surely, 2^321139881 is an apocalyptic number.

321139881 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

It is an amenable number.

321139881 is a deficient number, since it is larger than the sum of its proper divisors (200524119).

321139881 is a wasteful number, since it uses less digits than its factorization.

321139881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2174 (or 2171 counting only the distinct ones).

The product of its digits is 10368, while the sum is 36.

The square root of 321139881 is about 17920.3761400256. The cubic root of 321139881 is about 684.8015700309.

The spelling of 321139881 in words is "three hundred twenty-one million, one hundred thirty-nine thousand, eight hundred eighty-one".