31021200000000 has 1188 divisors, whose sum is σ = 128065371930496. Its totient is φ = 7084800000000.

The previous prime is 31021199999983. The next prime is 31021200000019. The reversal of 31021200000000 is 212013.

It is a happy number.

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

It is a super Niven number, because it is divisible the sum of any subset of its (nonzero) digits.

It is an unprimeable number.

It is a polite number, since it can be written in 107 ways as a sum of consecutive naturals, for example, 25199999385 + ... + 25200000615.

Almost surely, 2^{31021200000000} is an apocalyptic number.

31021200000000 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 31021200000000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (64032685965248).

31021200000000 is an abundant number, since it is smaller than the sum of its proper divisors (97044171930496).

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

31021200000000 is an frugal number, since it uses more digits than its factorization.

31021200000000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1304 (or 1248 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 9.

Adding to 31021200000000 its reverse (212013), we get a palindrome (31021200212013).

The spelling of 31021200000000 in words is "thirty-one trillion, twenty-one billion, two hundred million", and thus it is an aban number.