31220002213 has 4 divisors (see below), whose sum is σ = 31224018220. Its totient is φ = 31215986208.

The previous prime is 31220002181. The next prime is 31220002217.

31220002213 is nontrivially palindromic in base 10.

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 12078449604 + 19141552609 = 109902^2 + 138353^2 .

It is a cyclic number.

It is not a de Polignac number, because 31220002213 - 2⁵ = 31220002181 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 (31220002217) 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, 1996320 + ... + 2011897.

It is an arithmetic number, because the mean of its divisors is an integer number (7806004555).

Almost surely, 2^31220002213 is an apocalyptic number.

It is an amenable number.

31220002213 is a deficient number, since it is larger than the sum of its proper divisors (4016007).

31220002213 is an equidigital number, since it uses as much as digits as its factorization.

31220002213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4016006.

The product of its (nonzero) digits is 144, while the sum is 16.

It can be divided in two parts, 3122000 and 2213, that added together give a palindrome (3124213).

The spelling of 31220002213 in words is "thirty-one billion, two hundred twenty million, two thousand, two hundred thirteen".