13220402431231 has 4 divisors (see below), whose sum is σ = 13225329904072. Its totient is φ = 13215474958392.

The previous prime is 13220402431211. The next prime is 13220402431237. The reversal of 13220402431231 is 13213420402231.

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

It is a cyclic number.

It is not a de Polignac number, because 13220402431231 - 2³⁵ = 13186042692863 is a prime.

It is a super-2 number, since 2×13220402431231² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 13220402431231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13220402431237) 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, 2463732396 + ... + 2463737761.

It is an arithmetic number, because the mean of its divisors is an integer number (3306332476018).

Almost surely, 2^{13220402431231} is an apocalyptic number.

13220402431231 is a deficient number, since it is larger than the sum of its proper divisors (4927472841).

13220402431231 is an equidigital number, since it uses as much as digits as its factorization.

13220402431231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4927472840.

The product of its (nonzero) digits is 6912, while the sum is 28.

Adding to 13220402431231 its reverse (13213420402231), we get a palindrome (26433822833462).

The spelling of 13220402431231 in words is "thirteen trillion, two hundred twenty billion, four hundred two million, four hundred thirty-one thousand, two hundred thirty-one".