204351031221 has 8 divisors (see below), whose sum is σ = 272476427040. Its totient is φ = 136229828112.

The previous prime is 204351031193. The next prime is 204351031229. The reversal of 204351031221 is 122130153402.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 204351031221 - 2¹⁹ = 204350506933 is a prime.

It is a super-2 number, since 2×204351031221² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 204351031191 and 204351031200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204351031229) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 932631 + ... + 1130708.

It is an arithmetic number, because the mean of its divisors is an integer number (34059553380).

Almost surely, 2^204351031221 is an apocalyptic number.

It is an amenable number.

204351031221 is a deficient number, since it is larger than the sum of its proper divisors (68125395819).

204351031221 is a wasteful number, since it uses less digits than its factorization.

204351031221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2096355.

The product of its (nonzero) digits is 1440, while the sum is 24.

Adding to 204351031221 its reverse (122130153402), we get a palindrome (326481184623).

The spelling of 204351031221 in words is "two hundred four billion, three hundred fifty-one million, thirty-one thousand, two hundred twenty-one".