204231431021 has 4 divisors (see below), whose sum is σ = 204233017632. Its totient is φ = 204229844412.

The previous prime is 204231431017. The next prime is 204231431023. The reversal of 204231431021 is 120134132402.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 204231431021 - 2² = 204231431017 is a prime.

It is a super-2 number, since 2×204231431021² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204231431023) 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, 581345 + ... + 863958.

It is an arithmetic number, because the mean of its divisors is an integer number (51058254408).

Almost surely, 2^204231431021 is an apocalyptic number.

It is an amenable number.

204231431021 is a deficient number, since it is larger than the sum of its proper divisors (1586611).

204231431021 is a wasteful number, since it uses less digits than its factorization.

204231431021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1586610.

The product of its (nonzero) digits is 1152, while the sum is 23.

Adding to 204231431021 its reverse (120134132402), we get a palindrome (324365563423).

The spelling of 204231431021 in words is "two hundred four billion, two hundred thirty-one million, four hundred thirty-one thousand, twenty-one".