31220422402213 has 18 divisors (see below), whose sum is σ = 34523385842918. Its totient is φ = 28212245827920.

The previous prime is 31220422402171. The next prime is 31220422402243.

31220422402213 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in only one way, i.e., 18335926510209 + 12884495892004 = 4282047^2 + 3589498^2 .

It is not a de Polignac number, because 31220422402213 - 2²⁹ = 31219885531301 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 (31220422402243) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 1251270 + ... + 8000407.

Almost surely, 2^{31220422402213} is an apocalyptic number.

It is an amenable number.

31220422402213 is a deficient number, since it is larger than the sum of its proper divisors (3302963440705).

31220422402213 is an equidigital number, since it uses as much as digits as its factorization.

31220422402213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9252033 (or 9251855 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 28.

It can be divided in two parts, 3122042 and 2402213, that added together give a palindrome (5524255).

The spelling of 31220422402213 in words is "thirty-one trillion, two hundred twenty billion, four hundred twenty-two million, four hundred two thousand, two hundred thirteen".