31121012 has 36 divisors (see below), whose sum is σ = 62102880. Its totient is φ = 13601952.

The previous prime is 31120997. The next prime is 31121021. The reversal of 31121012 is 21012113.

It is a junction number, because it is equal to n+sod(n) for n = 31120984 and 31121002.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11633 + ... + 14055.

It is an arithmetic number, because the mean of its divisors is an integer number (1725080).

Almost surely, 2^31121012 is an apocalyptic number.

It is an amenable number.

31121012 is a deficient number, since it is larger than the sum of its proper divisors (30981868).

31121012 is a wasteful number, since it uses less digits than its factorization.

31121012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2472 (or 2457 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 11.

The square root of 31121012 is about 5578.6209765497. The cubic root of 31121012 is about 314.5462923138.

Adding to 31121012 its reverse (21012113), we get a palindrome (52133125).

The spelling of 31121012 in words is "thirty-one million, one hundred twenty-one thousand, twelve".