31220121313020 has 48 divisors (see below), whose sum is σ = 87439326468480. Its totient is φ = 8323176465216.

The previous prime is 31220121313013. The next prime is 31220121313033. The reversal of 31220121313020 is 2031312102213.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 68182990 + ... + 68639349.

It is an arithmetic number, because the mean of its divisors is an integer number (1821652634760).

Almost surely, 2^{31220121313020} is an apocalyptic number.

31220121313020 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

31220121313020 is an abundant number, since it is smaller than the sum of its proper divisors (56219205155460).

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

31220121313020 is a wasteful number, since it uses less digits than its factorization.

31220121313020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136826154 (or 136826152 counting only the distinct ones).

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

Adding to 31220121313020 its reverse (2031312102213), we get a palindrome (33251433415233).

The spelling of 31220121313020 in words is "thirty-one trillion, two hundred twenty billion, one hundred twenty-one million, three hundred thirteen thousand, twenty".