31123311013020 has 48 divisors (see below), whose sum is σ = 88999425543168. Its totient is φ = 8122963440960.

The previous prime is 31123311012979. The next prime is 31123311013037. The reversal of 31123311013020 is 2031011332113.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5518314736 + ... + 5518320375.

It is an arithmetic number, because the mean of its divisors is an integer number (1854154698816).

Almost surely, 2^{31123311013020} is an apocalyptic number.

31123311013020 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

31123311013020 is an abundant number, since it is smaller than the sum of its proper divisors (57876114530148).

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

31123311013020 is a wasteful number, since it uses less digits than its factorization.

31123311013020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11036635170 (or 11036635168 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 21.

Adding to 31123311013020 its reverse (2031011332113), we get a palindrome (33154322345133).

The spelling of 31123311013020 in words is "thirty-one trillion, one hundred twenty-three billion, three hundred eleven million, thirteen thousand, twenty".