31130002213220 has 72 divisors (see below), whose sum is σ = 68326129271400. Its totient is φ = 11912321562624.

The previous prime is 31130002213157. The next prime is 31130002213267. The reversal of 31130002213220 is 2231220003113.

It can be written as a sum of positive squares in 12 ways, for example, as 4905525084964 + 26224477128256 = 2214842^2 + 5120984^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 31130002213192 and 31130002213201.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6656405 + ... + 10323164.

Almost surely, 2^{31130002213220} is an apocalyptic number.

It is an amenable number.

31130002213220 is an abundant number, since it is smaller than the sum of its proper divisors (37196127058180).

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

31130002213220 is a wasteful number, since it uses less digits than its factorization.

31130002213220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16979745 (or 16979714 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 31130002213220 its reverse (2231220003113), we get a palindrome (33361222216333).

The spelling of 31130002213220 in words is "thirty-one trillion, one hundred thirty billion, two million, two hundred thirteen thousand, two hundred twenty".