220031231021 has 32 divisors (see below), whose sum is σ = 259012588800. Its totient is φ = 183025889280.

The previous prime is 220031230981. The next prime is 220031231093. The reversal of 220031231021 is 120132130022.

It is a cyclic number.

It is not a de Polignac number, because 220031231021 - 2³⁰ = 218957489197 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220031230021) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 29376845 + ... + 29384333.

It is an arithmetic number, because the mean of its divisors is an integer number (8094143400).

Almost surely, 2^220031231021 is an apocalyptic number.

It is an amenable number.

220031231021 is a deficient number, since it is larger than the sum of its proper divisors (38981357779).

220031231021 is an equidigital number, since it uses as much as digits as its factorization.

220031231021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8469.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 220031231021 its reverse (120132130022), we get a palindrome (340163361043).

The spelling of 220031231021 in words is "two hundred twenty billion, thirty-one million, two hundred thirty-one thousand, twenty-one".