31233921 has 4 divisors (see below), whose sum is σ = 41645232. Its totient is φ = 20822612.

The previous prime is 31233919. The next prime is 31233941. The reversal of 31233921 is 12933213.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 31233921 - 2¹ = 31233919 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31233891 and 31233900.

It is not an unprimeable number, because it can be changed into a prime (31233911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5205651 + ... + 5205656.

It is an arithmetic number, because the mean of its divisors is an integer number (10411308).

Almost surely, 2^31233921 is an apocalyptic number.

It is an amenable number.

31233921 is a deficient number, since it is larger than the sum of its proper divisors (10411311).

31233921 is a wasteful number, since it uses less digits than its factorization.

31233921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10411310.

The product of its digits is 972, while the sum is 24.

The square root of 31233921 is about 5588.7316092294. The cubic root of 31233921 is about 314.9262311510.

The spelling of 31233921 in words is "thirty-one million, two hundred thirty-three thousand, nine hundred twenty-one".