31020021220313 has 4 divisors (see below), whose sum is σ = 31149812104320. Its totient is φ = 30890230336308.

The previous prime is 31020021220271. The next prime is 31020021220369. The reversal of 31020021220313 is 31302212002013.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 31020021220313 - 2¹⁴ = 31020021203929 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31020021220373) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64895441645 + ... + 64895442122.

It is an arithmetic number, because the mean of its divisors is an integer number (7787453026080).

Almost surely, 2^{31020021220313} is an apocalyptic number.

It is an amenable number.

31020021220313 is a deficient number, since it is larger than the sum of its proper divisors (129790884007).

31020021220313 is a wasteful number, since it uses less digits than its factorization.

31020021220313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129790884006.

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

Adding to 31020021220313 its reverse (31302212002013), we get a palindrome (62322233222326).

The spelling of 31020021220313 in words is "thirty-one trillion, twenty billion, twenty-one million, two hundred twenty thousand, three hundred thirteen".