31320212130 has 24 divisors (see below), whose sum is σ = 81432551772. Its totient is φ = 8352056544.

The previous prime is 31320212107. The next prime is 31320212149. The reversal of 31320212130 is 3121202313.

31320212130 is a `hidden beast` number, since 3 + 1 + 320 + 212 + 130 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 28641839121 + 2678373009 = 169239^2 + 51753^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 174001089 + ... + 174001268.

Almost surely, 2^31320212130 is an apocalyptic number.

31320212130 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

31320212130 is an abundant number, since it is smaller than the sum of its proper divisors (50112339642).

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

31320212130 is a wasteful number, since it uses less digits than its factorization.

31320212130 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 348002370 (or 348002367 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

Adding to 31320212130 its reverse (3121202313), we get a palindrome (34441414443).

The spelling of 31320212130 in words is "thirty-one billion, three hundred twenty million, two hundred twelve thousand, one hundred thirty".