232121631 has 8 divisors (see below), whose sum is σ = 353709184. Its totient is φ = 132640920.

The previous prime is 232121599. The next prime is 232121641. The reversal of 232121631 is 136121232.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 232121631 - 2⁵ = 232121599 is a prime.

It is a super-2 number, since 2×232121631² = 107760903156200322, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21), and also a Moran number because the ratio is a prime number: 11053411 = 232121631 / (2 + 3 + 2 + 1 + 2 + 1 + 6 + 3 + 1).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 232121598 and 232121607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (232121641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5526685 + ... + 5526726.

It is an arithmetic number, because the mean of its divisors is an integer number (44213648).

Almost surely, 2^232121631 is an apocalyptic number.

232121631 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

232121631 is a deficient number, since it is larger than the sum of its proper divisors (121587553).

232121631 is a wasteful number, since it uses less digits than its factorization.

232121631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11053421.

The product of its digits is 432, while the sum is 21.

The square root of 232121631 is about 15235.5384217296. The cubic root of 232121631 is about 614.5707282642.

Adding to 232121631 its reverse (136121232), we get a palindrome (368242863).

The spelling of 232121631 in words is "two hundred thirty-two million, one hundred twenty-one thousand, six hundred thirty-one".