31111012220 has 24 divisors (see below), whose sum is σ = 65368011744. Its totient is φ = 12437759936.

The previous prime is 31111012211. The next prime is 31111012237. The reversal of 31111012220 is 2221011113.

It is a junction number, because it is equal to n+sod(n) for n = 31111012195 and 31111012204.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 376832 + ... + 451911.

It is an arithmetic number, because the mean of its divisors is an integer number (2723667156).

Almost surely, 2^31111012220 is an apocalyptic number.

It is an amenable number.

31111012220 is an abundant number, since it is smaller than the sum of its proper divisors (34256999524).

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

31111012220 is a wasteful number, since it uses less digits than its factorization.

31111012220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 830629 (or 830627 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 14.

Adding to 31111012220 its reverse (2221011113), we get a palindrome (33332023333).

The spelling of 31111012220 in words is "thirty-one billion, one hundred eleven million, twelve thousand, two hundred twenty".