31121031012 has 48 divisors (see below), whose sum is σ = 74180800512. Its totient is φ = 10150216480.

The previous prime is 31121030957. The next prime is 31121031091. The reversal of 31121031012 is 21013012113.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 31121030982 and 31121031000.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3832837 + ... + 3840947.

It is an arithmetic number, because the mean of its divisors is an integer number (1545433344).

Almost surely, 2^31121031012 is an apocalyptic number.

It is an amenable number.

31121031012 is an abundant number, since it is smaller than the sum of its proper divisors (43059769500).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31121031012 is a wasteful number, since it uses less digits than its factorization.

31121031012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14968 (or 14966 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 15.

Adding to 31121031012 its reverse (21013012113), we get a palindrome (52134043125).

The spelling of 31121031012 in words is "thirty-one billion, one hundred twenty-one million, thirty-one thousand, twelve".