31231120121020 has 24 divisors (see below), whose sum is σ = 65635686424224. Its totient is φ = 12482860587456.

The previous prime is 31231120120961. The next prime is 31231120121027. The reversal of 31231120121020 is 2012102113213.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31231120121027) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 599189599 + ... + 599241718.

It is an arithmetic number, because the mean of its divisors is an integer number (2734820267676).

Almost surely, 2^{31231120121020} is an apocalyptic number.

It is an amenable number.

31231120121020 is an abundant number, since it is smaller than the sum of its proper divisors (34404566303204).

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

31231120121020 is a wasteful number, since it uses less digits than its factorization.

31231120121020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1198432629 (or 1198432627 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 31231120121020 its reverse (2012102113213), we get a palindrome (33243222234233).

The spelling of 31231120121020 in words is "thirty-one trillion, two hundred thirty-one billion, one hundred twenty million, one hundred twenty-one thousand, twenty".