204231123231021 has 24 divisors (see below), whose sum is σ = 305927167413504. Its totient is φ = 136153765624320.

The previous prime is 204231123230989. The next prime is 204231123231041. The reversal of 204231123231021 is 120132321132402.

204231123231021 is a `hidden beast` number, since 2 + 0 + 4 + 2 + 311 + 2 + 32 + 310 + 2 + 1 = 666.

It is not a de Polignac number, because 204231123231021 - 2⁵ = 204231123230989 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204231123231041) 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, 154707460 + ... + 156021986.

It is an arithmetic number, because the mean of its divisors is an integer number (12746965308896).

Almost surely, 2^{204231123231021} is an apocalyptic number.

It is an amenable number.

204231123231021 is a deficient number, since it is larger than the sum of its proper divisors (101696044182483).

204231123231021 is an equidigital number, since it uses as much as digits as its factorization.

204231123231021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1953903 (or 1953891 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

Adding to 204231123231021 its reverse (120132321132402), we get a palindrome (324363444363423).

The spelling of 204231123231021 in words is "two hundred four trillion, two hundred thirty-one billion, one hundred twenty-three million, two hundred thirty-one thousand, twenty-one".