232238211921 has 9 divisors (see below), whose sum is σ = 335457283291. Its totient is φ = 154824510792.

The previous prime is 232238211899. The next prime is 232238212007. The reversal of 232238211921 is 129112832232.

The square root of 232238211921 is 481911.

It is a perfect power (a square), and thus also a powerful number.

232238211921 is a `hidden beast` number, since 2 + 322 + 38 + 211 + 92 + 1 = 666.

232238211921 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 30784457025 + 201453754896 = 175455^2 + 448836^2 .

It is a tau number, because it is divible by the number of its divisors (9).

It is a de Polignac number, because none of the positive numbers 2^k-232238211921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (232238211221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 1365415 + ... + 1526051.

Almost surely, 2^232238211921 is an apocalyptic number.

232238211921 is the 481911-st square number.

232238211921 is the 240956-th centered octagonal number.

It is an amenable number.

232238211921 is a deficient number, since it is larger than the sum of its proper divisors (103219071370).

232238211921 is an frugal number, since it uses more digits than its factorization.

232238211921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 321280 (or 160640 counting only the distinct ones).

The product of its digits is 20736, while the sum is 36.

Multiplying 232238211921 by its sum of digits (36), we get a square (8360575629156 = 2891466²).

The spelling of 232238211921 in words is "two hundred thirty-two billion, two hundred thirty-eight million, two hundred eleven thousand, nine hundred twenty-one".