31210002220021 has 2 divisors, whose sum is σ = 31210002220022. Its totient is φ = 31210002220020.

The previous prime is 31210002220013. The next prime is 31210002220087. The reversal of 31210002220021 is 12002220001213.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 29993038028100 + 1216964191921 = 5476590^2 + 1103161^2 .

It is a cyclic number.

It is not a de Polignac number, because 31210002220021 - 2³ = 31210002220013 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31210002219977 and 31210002220004.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31210002223021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15605001110010 + 15605001110011.

It is an arithmetic number, because the mean of its divisors is an integer number (15605001110011).

Almost surely, 2^{31210002220021} is an apocalyptic number.

It is an amenable number.

31210002220021 is a deficient number, since it is larger than the sum of its proper divisors (1).

31210002220021 is an equidigital number, since it uses as much as digits as its factorization.

31210002220021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 31210002220021 its reverse (12002220001213), we get a palindrome (43212222221234).

The spelling of 31210002220021 in words is "thirty-one trillion, two hundred ten billion, two million, two hundred twenty thousand, twenty-one".