31020123120 has 80 divisors (see below), whose sum is σ = 109899870720. Its totient is φ = 7090313472.

The previous prime is 31020123119. The next prime is 31020123139. The reversal of 31020123120 is 2132102013.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a zygodrome in base 2.

It is a self number, because there is not a number n which added to its sum of digits gives 31020123120.

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, 9230500 + ... + 9233859.

It is an arithmetic number, because the mean of its divisors is an integer number (1373748384).

Almost surely, 2^31020123120 is an apocalyptic number.

31020123120 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

31020123120 is an abundant number, since it is smaller than the sum of its proper divisors (78879747600).

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

31020123120 is a wasteful number, since it uses less digits than its factorization.

31020123120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18464382 (or 18464376 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 15.

Adding to 31020123120 its reverse (2132102013), we get a palindrome (33152225133).

The spelling of 31020123120 in words is "thirty-one billion, twenty million, one hundred twenty-three thousand, one hundred twenty".