232971921 has 36 divisors (see below), whose sum is σ = 421578612. Its totient is φ = 122883264.

The previous prime is 232971917. The next prime is 232971989. The reversal of 232971921 is 129179232.

It can be written as a sum of positive squares in 2 ways, for example, as 11289600 + 221682321 = 3360^2 + 14889^2 .

It is not a de Polignac number, because 232971921 - 2² = 232971917 is a prime.

It is not an unprimeable number, because it can be changed into a prime (232971911) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 14586 + ... + 26051.

It is an arithmetic number, because the mean of its divisors is an integer number (11710517).

Almost surely, 2^232971921 is an apocalyptic number.

232971921 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

232971921 is a deficient number, since it is larger than the sum of its proper divisors (188606691).

232971921 is a wasteful number, since it uses less digits than its factorization.

232971921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40670 (or 40660 counting only the distinct ones).

The product of its digits is 13608, while the sum is 36.

The square root of 232971921 is about 15263.4177365359. The cubic root of 232971921 is about 615.3202298171.

The spelling of 232971921 in words is "two hundred thirty-two million, nine hundred seventy-one thousand, nine hundred twenty-one".