31201212120 has 128 divisors (see below), whose sum is σ = 105186816000. Its totient is φ = 7346363904.

The previous prime is 31201212043. The next prime is 31201212131. The reversal of 31201212120 is 2121210213.

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

It is a self number, because there is not a number n which added to its sum of digits gives 31201212120.

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, 398920 + ... + 470679.

It is an arithmetic number, because the mean of its divisors is an integer number (821772000).

Almost surely, 2^31201212120 is an apocalyptic number.

31201212120 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

31201212120 is an abundant number, since it is smaller than the sum of its proper divisors (73985603880).

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

31201212120 is a wasteful number, since it uses less digits than its factorization.

31201212120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 869649 (or 869645 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 31201212120 its reverse (2121210213), we get a palindrome (33322422333).

The spelling of 31201212120 in words is "thirty-one billion, two hundred one million, two hundred twelve thousand, one hundred twenty".