400220506331 has 4 divisors (see below), whose sum is σ = 406193946792. Its totient is φ = 394247065872.

The previous prime is 400220506289. The next prime is 400220506333. The reversal of 400220506331 is 133605022004.

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 400220506331 - 2²⁶ = 400153397467 is a prime.

It is a super-2 number, since 2×400220506331² (a number of 24 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 400220506331.

It is not an unprimeable number, because it can be changed into a prime (400220506333) 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, 2986720130 + ... + 2986720263.

It is an arithmetic number, because the mean of its divisors is an integer number (101548486698).

Almost surely, 2^400220506331 is an apocalyptic number.

400220506331 is a deficient number, since it is larger than the sum of its proper divisors (5973440461).

400220506331 is an equidigital number, since it uses as much as digits as its factorization.

400220506331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5973440460.

The product of its (nonzero) digits is 4320, while the sum is 26.

Adding to 400220506331 its reverse (133605022004), we get a palindrome (533825528335).

The spelling of 400220506331 in words is "four hundred billion, two hundred twenty million, five hundred six thousand, three hundred thirty-one".