31020010120 has 48 divisors (see below), whose sum is σ = 76716855180. Its totient is φ = 11280001920.

The previous prime is 31020010111. The next prime is 31020010127. The reversal of 31020010120 is 2101002013.

It can be written as a sum of positive squares in 2 ways, for example, as 30968256484 + 51753636 = 175978^2 + 7194^2 .

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a junction number, because it is equal to n+sod(n) for n = 31020010097 and 31020010106.

It is not an unprimeable number, because it can be changed into a prime (31020010127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3199707 + ... + 3209386.

Almost surely, 2^31020010120 is an apocalyptic number.

It is an amenable number.

31020010120 is an abundant number, since it is smaller than the sum of its proper divisors (45696845060).

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

31020010120 is a wasteful number, since it uses less digits than its factorization.

31020010120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6409126 (or 6409111 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 10.

Adding to 31020010120 its reverse (2101002013), we get a palindrome (33121012133).

The spelling of 31020010120 in words is "thirty-one billion, twenty million, ten thousand, one hundred twenty".