31111020012 has 48 divisors (see below), whose sum is σ = 77360274432. Its totient is φ = 9708399360.

The previous prime is 31111019963. The next prime is 31111020019. The reversal of 31111020012 is 21002011113.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a self number, because there is not a number n which added to its sum of digits gives 31111020012.

It is not an unprimeable number, because it can be changed into a prime (31111020019) by changing a digit.

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, 1186189 + ... + 1212132.

It is an arithmetic number, because the mean of its divisors is an integer number (1611672384).

Almost surely, 2^31111020012 is an apocalyptic number.

It is an amenable number.

31111020012 is an abundant number, since it is smaller than the sum of its proper divisors (46249254420).

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

31111020012 is a wasteful number, since it uses less digits than its factorization.

31111020012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2398398 (or 2398396 counting only the distinct ones).

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

Adding to 31111020012 its reverse (21002011113), we get a palindrome (52113031125).

The spelling of 31111020012 in words is "thirty-one billion, one hundred eleven million, twenty thousand, twelve".