31020002130320 has 80 divisors (see below), whose sum is σ = 82488129195648. Its totient is φ = 10627229030400.

The previous prime is 31020002130283. The next prime is 31020002130323. The reversal of 31020002130320 is 2303120002013.

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

It is not an unprimeable number, because it can be changed into a prime (31020002130323) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20627906 + ... + 22080545.

Almost surely, 2^{31020002130320} is an apocalyptic number.

It is an amenable number.

31020002130320 is an abundant number, since it is smaller than the sum of its proper divisors (51468127065328).

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

31020002130320 is a wasteful number, since it uses less digits than its factorization.

31020002130320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42709768 (or 42709762 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 17.

Adding to 31020002130320 its reverse (2303120002013), we get a palindrome (33323122132333).

The spelling of 31020002130320 in words is "thirty-one trillion, twenty billion, two million, one hundred thirty thousand, three hundred twenty".