31212130331020 has 24 divisors (see below), whose sum is σ = 65549957277168. Its totient is φ = 12483998116800.

The previous prime is 31212130331017. The next prime is 31212130331071. The reversal of 31212130331020 is 2013303121213.

It is a junction number, because it is equal to n+sod(n) for n = 31212130330982 and 31212130331000.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 53076246 + ... + 53661085.

It is an arithmetic number, because the mean of its divisors is an integer number (2731248219882).

Almost surely, 2^{31212130331020} is an apocalyptic number.

It is an amenable number.

31212130331020 is an abundant number, since it is smaller than the sum of its proper divisors (34337826946148).

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

31212130331020 is a wasteful number, since it uses less digits than its factorization.

31212130331020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106751961 (or 106751959 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 22.

Adding to 31212130331020 its reverse (2013303121213), we get a palindrome (33225433452233).

The spelling of 31212130331020 in words is "thirty-one trillion, two hundred twelve billion, one hundred thirty million, three hundred thirty-one thousand, twenty".