31313012020021 has 8 divisors (see below), whose sum is σ = 31544321108760. Its totient is φ = 31081742742528.

The previous prime is 31313012019973. The next prime is 31313012020033. The reversal of 31313012020021 is 12002021031313.

It can be written as a sum of positive squares in 4 ways, for example, as 164491080625 + 31148520939396 = 405575^2 + 5581086^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31313012020021 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31313012021021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8373006 + ... + 11520991.

It is an arithmetic number, because the mean of its divisors is an integer number (3943040138595).

Almost surely, 2^{31313012020021} is an apocalyptic number.

It is an amenable number.

31313012020021 is a deficient number, since it is larger than the sum of its proper divisors (231309088739).

31313012020021 is a wasteful number, since it uses less digits than its factorization.

31313012020021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19905623.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 31313012020021 its reverse (12002021031313), we get a palindrome (43315033051334).

The spelling of 31313012020021 in words is "thirty-one trillion, three hundred thirteen billion, twelve million, twenty thousand, twenty-one".