204421331231 has 4 divisors (see below), whose sum is σ = 220146049032. Its totient is φ = 188696613432.

The previous prime is 204421331183. The next prime is 204421331237. The reversal of 204421331231 is 132133124402.

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 204421331231 - 2¹⁴ = 204421314847 is a prime.

It is a super-2 number, since 2×204421331231² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 204421331231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204421331237) 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, 7862358881 + ... + 7862358906.

It is an arithmetic number, because the mean of its divisors is an integer number (55036512258).

Almost surely, 2^204421331231 is an apocalyptic number.

204421331231 is a deficient number, since it is larger than the sum of its proper divisors (15724717801).

204421331231 is a wasteful number, since it uses less digits than its factorization.

204421331231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15724717800.

The product of its (nonzero) digits is 3456, while the sum is 26.

Adding to 204421331231 its reverse (132133124402), we get a palindrome (336554455633).

The spelling of 204421331231 in words is "two hundred four billion, four hundred twenty-one million, three hundred thirty-one thousand, two hundred thirty-one".