31332121 has 4 divisors (see below), whose sum is σ = 32981200. Its totient is φ = 29683044.

The previous prime is 31332109. The next prime is 31332149. The reversal of 31332121 is 12123313.

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, and also an emirpimes, since its reverse is a distinct semiprime: 12123313 = 89 ⋅136217.

It is a cyclic number.

It is not a de Polignac number, because 31332121 - 2⁵ = 31332089 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31332095 and 31332104.

It is not an unprimeable number, because it can be changed into a prime (31332181) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 824511 + ... + 824548.

It is an arithmetic number, because the mean of its divisors is an integer number (8245300).

Almost surely, 2^31332121 is an apocalyptic number.

It is an amenable number.

31332121 is a deficient number, since it is larger than the sum of its proper divisors (1649079).

31332121 is a wasteful number, since it uses less digits than its factorization.

31332121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1649078.

The product of its digits is 108, while the sum is 16.

The square root of 31332121 is about 5597.5102501023. The cubic root of 31332121 is about 315.2559304120.

Adding to 31332121 its reverse (12123313), we get a palindrome (43455434).

The spelling of 31332121 in words is "thirty-one million, three hundred thirty-two thousand, one hundred twenty-one".