31121000010 has 64 divisors (see below), whose sum is σ = 83518041600. Its totient is φ = 8246062656.

The previous prime is 31120999991. The next prime is 31121000059. The reversal of 31121000010 is 1000012113.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 31120999956 and 31121000001.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 324690 + ... + 409469.

It is an arithmetic number, because the mean of its divisors is an integer number (1304969400).

Almost surely, 2^31121000010 is an apocalyptic number.

31121000010 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

31121000010 is an abundant number, since it is smaller than the sum of its proper divisors (52397041590).

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

31121000010 is a wasteful number, since it uses less digits than its factorization.

31121000010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 734332 (or 734326 counting only the distinct ones).

The product of its (nonzero) digits is 6, while the sum is 9.

Adding to 31121000010 its reverse (1000012113), we get a palindrome (32121012123).

The spelling of 31121000010 in words is "thirty-one billion, one hundred twenty-one million, ten", and thus it is an aban number.