31213200022000 has 40 divisors (see below), whose sum is σ = 75473517658032. Its totient is φ = 12485280008000.

The previous prime is 31213200021947. The next prime is 31213200022001. The reversal of 31213200022000 is 22000231213.

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×31213200022000² (a number of 28 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31213200022001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7803298006 + ... + 7803302005.

Almost surely, 2^{31213200022000} is an apocalyptic number.

It is an amenable number.

31213200022000 is an abundant number, since it is smaller than the sum of its proper divisors (44260317636032).

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

31213200022000 is a wasteful number, since it uses less digits than its factorization.

31213200022000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15606600034 (or 15606600018 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 16.

Adding to 31213200022000 its reverse (22000231213), we get a palindrome (31235200253213).

The spelling of 31213200022000 in words is "thirty-one trillion, two hundred thirteen billion, two hundred million, twenty-two thousand".