31221124 has 24 divisors (see below), whose sum is σ = 59820768. Its totient is φ = 14139840.

The previous prime is 31221107. The next prime is 31221149. The reversal of 31221124 is 42112213.

It is a junction number, because it is equal to n+sod(n) for n = 31221098 and 31221107.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12639 + ... + 14905.

It is an arithmetic number, because the mean of its divisors is an integer number (2492532).

Almost surely, 2^31221124 is an apocalyptic number.

It is an amenable number.

31221124 is a deficient number, since it is larger than the sum of its proper divisors (28599644).

31221124 is a wasteful number, since it uses less digits than its factorization.

31221124 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2595 (or 2593 counting only the distinct ones).

The product of its digits is 96, while the sum is 16.

The square root of 31221124 is about 5587.5865988815. The cubic root of 31221124 is about 314.8832152954.

Adding to 31221124 its reverse (42112213), we get a palindrome (73333337).

The spelling of 31221124 in words is "thirty-one million, two hundred twenty-one thousand, one hundred twenty-four".