31213222112000 has 144 divisors (see below), whose sum is σ = 77761200421632. Its totient is φ = 12484459929600.

The previous prime is 31213222111943. The next prime is 31213222112089. The reversal of 31213222112000 is 21122231213.

It is a super-2 number, since 2×31213222112000² (a number of 28 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 762635537 + ... + 762676463.

Almost surely, 2^{31213222112000} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31213222112000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38880600210816).

31213222112000 is an abundant number, since it is smaller than the sum of its proper divisors (46547978309632).

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

31213222112000 is an equidigital number, since it uses as much as digits as its factorization.

31213222112000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64791 (or 64767 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 31213222112000 its reverse (21122231213), we get a palindrome (31234344343213).

The spelling of 31213222112000 in words is "thirty-one trillion, two hundred thirteen billion, two hundred twenty-two million, one hundred twelve thousand".