310213220120021 has 4 divisors (see below), whose sum is σ = 310213290823500. Its totient is φ = 310213149416544.

The previous prime is 310213220119991. The next prime is 310213220120047. The reversal of 310213220120021 is 120021022312013.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 80117268180625 + 230095951939396 = 8950825^2 + 15168914^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-310213220120021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 310213220119975 and 310213220120002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (310213220020021) 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, 28301816 + ... + 37701713.

It is an arithmetic number, because the mean of its divisors is an integer number (77553322705875).

Almost surely, 2^{310213220120021} is an apocalyptic number.

It is an amenable number.

310213220120021 is a deficient number, since it is larger than the sum of its proper divisors (70703479).

310213220120021 is an equidigital number, since it uses as much as digits as its factorization.

310213220120021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70703478.

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 310213220120021 its reverse (120021022312013), we get a palindrome (430234242432034).

The spelling of 310213220120021 in words is "three hundred ten trillion, two hundred thirteen billion, two hundred twenty million, one hundred twenty thousand, twenty-one".