31020303013021 has 6 divisors (see below), whose sum is σ = 36084842280510. Its totient is φ = 26588831153976.

The previous prime is 31020303013013. The next prime is 31020303013027. The reversal of 31020303013021 is 12031030302013.

It can be written as a sum of positive squares in only one way, i.e., 21339872640100 + 9680430372921 = 4619510^2 + 3111339^2 .

It is not a de Polignac number, because 31020303013021 - 2³ = 31020303013013 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31020303013021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31020303013027) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 316533704166 + ... + 316533704263.

It is an arithmetic number, because the mean of its divisors is an integer number (6014140380085).

Almost surely, 2^{31020303013021} is an apocalyptic number.

It is an amenable number.

31020303013021 is a deficient number, since it is larger than the sum of its proper divisors (5064539267489).

31020303013021 is an equidigital number, since it uses as much as digits as its factorization.

31020303013021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 633067408443 (or 633067408436 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 19.

Adding to 31020303013021 its reverse (12031030302013), we get a palindrome (43051333315034).

The spelling of 31020303013021 in words is "thirty-one trillion, twenty billion, three hundred three million, thirteen thousand, twenty-one".