31021996 has 12 divisors (see below), whose sum is σ = 56160720. Its totient is φ = 14976080.

The previous prime is 31021951. The next prime is 31021999. The reversal of 31021996 is 69912013.

It is not an unprimeable number, because it can be changed into a prime (31021999) 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, 133600 + ... + 133831.

It is an arithmetic number, because the mean of its divisors is an integer number (4680060).

Almost surely, 2^31021996 is an apocalyptic number.

It is an amenable number.

31021996 is a deficient number, since it is larger than the sum of its proper divisors (25138724).

31021996 is a wasteful number, since it uses less digits than its factorization.

31021996 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 267464 (or 267462 counting only the distinct ones).

The product of its (nonzero) digits is 2916, while the sum is 31.

The square root of 31021996 is about 5569.7393116734. The cubic root of 31021996 is about 314.2123463924.

The spelling of 31021996 in words is "thirty-one million, twenty-one thousand, nine hundred ninety-six".