31800324121930 has 192 divisors, whose sum is σ = 79227241309440. Its totient is φ = 9060423837696.

The previous prime is 31800324121903. The next prime is 31800324121931. The reversal of 31800324121930 is 3912142300813.

It is a super-2 number, since 2×31800324121930² (a number of 28 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 31800324121930.

It is not an unprimeable number, because it can be changed into a prime (31800324121931) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 3893220 + ... + 8874559.

It is an arithmetic number, because the mean of its divisors is an integer number (412641881820).

Almost surely, 2^{31800324121930} is an apocalyptic number.

31800324121930 is an abundant number, since it is smaller than the sum of its proper divisors (47426917187510).

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

31800324121930 is a wasteful number, since it uses less digits than its factorization.

31800324121930 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12767853 (or 12767846 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 37.

The spelling of 31800324121930 in words is "thirty-one trillion, eight hundred billion, three hundred twenty-four million, one hundred twenty-one thousand, nine hundred thirty".