31220402213 has 24 divisors (see below), whose sum is σ = 42235880064. Its totient is φ = 22456225440.

The previous prime is 31220402189. The next prime is 31220402231.

31220402213 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 31220402213 - 2¹⁸ = 31220140069 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31220402243) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1406681 + ... + 1428702.

It is an arithmetic number, because the mean of its divisors is an integer number (1759828336).

Almost surely, 2^31220402213 is an apocalyptic number.

It is an amenable number.

31220402213 is a deficient number, since it is larger than the sum of its proper divisors (11015477851).

31220402213 is a wasteful number, since it uses less digits than its factorization.

31220402213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2835425 (or 2835414 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

The spelling of 31220402213 in words is "thirty-one billion, two hundred twenty million, four hundred two thousand, two hundred thirteen".