31310121000 has 128 divisors (see below), whose sum is σ = 99531244800. Its totient is φ = 8191788800.

The previous prime is 31310120917. The next prime is 31310121023. The reversal of 31310121000 is 12101313.

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

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, 60541 + ... + 257459.

It is an arithmetic number, because the mean of its divisors is an integer number (777587850).

Almost surely, 2^31310121000 is an apocalyptic number.

31310121000 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31310121000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (49765622400).

31310121000 is an abundant number, since it is smaller than the sum of its proper divisors (68221123800).

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

31310121000 is a wasteful number, since it uses less digits than its factorization.

31310121000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 196996 (or 196982 counting only the distinct ones).

The product of its (nonzero) digits is 18, while the sum is 12.

Adding to 31310121000 its reverse (12101313), we get a palindrome (31322222313).

The spelling of 31310121000 in words is "thirty-one billion, three hundred ten million, one hundred twenty-one thousand".