31213321021020 has 96 divisors (see below), whose sum is σ = 89097579648000. Its totient is φ = 8163035023104.

The previous prime is 31213321021007. The next prime is 31213321021031. The reversal of 31213321021020 is 2012012331213.

It is a super-2 number, since 2×31213321021020² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 21391354 + ... + 22803873.

It is an arithmetic number, because the mean of its divisors is an integer number (928099788000).

Almost surely, 2^{31213321021020} is an apocalyptic number.

31213321021020 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

31213321021020 is an abundant number, since it is smaller than the sum of its proper divisors (57884258626980).

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

31213321021020 is a wasteful number, since it uses less digits than its factorization.

31213321021020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44195467 (or 44195465 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 21.

Adding to 31213321021020 its reverse (2012012331213), we get a palindrome (33225333352233).

The spelling of 31213321021020 in words is "thirty-one trillion, two hundred thirteen billion, three hundred twenty-one million, twenty-one thousand, twenty".