232156021 has 2 divisors, whose sum is σ = 232156022. Its totient is φ = 232156020.

The previous prime is 232155949. The next prime is 232156027. The reversal of 232156021 is 120651232.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 147258225 + 84897796 = 12135^2 + 9214^2 .

It is a cyclic number.

It is not a de Polignac number, because 232156021 - 2¹⁹ = 231631733 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 232155983 and 232156001.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (232156027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 116078010 + 116078011.

It is an arithmetic number, because the mean of its divisors is an integer number (116078011).

Almost surely, 2^232156021 is an apocalyptic number.

It is an amenable number.

232156021 is a deficient number, since it is larger than the sum of its proper divisors (1).

232156021 is an equidigital number, since it uses as much as digits as its factorization.

232156021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 232156021 is about 15236.6669911763. Note that the first 3 decimals coincide. The cubic root of 232156021 is about 614.6010773583.

The spelling of 232156021 in words is "two hundred thirty-two million, one hundred fifty-six thousand, twenty-one".