204352320521 has 16 divisors (see below), whose sum is σ = 211524540480. Its totient is φ = 197291592960.

The previous prime is 204352320463. The next prime is 204352320541. The reversal of 204352320521 is 125023253402.

It is a cyclic number.

It is not a de Polignac number, because 204352320521 - 2²⁶ = 204285211657 is a prime.

It is a super-2 number, since 2×204352320521² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (204352320541) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14661926 + ... + 14675856.

It is an arithmetic number, because the mean of its divisors is an integer number (13220283780).

Almost surely, 2^204352320521 is an apocalyptic number.

It is an amenable number.

204352320521 is a deficient number, since it is larger than the sum of its proper divisors (7172219959).

204352320521 is a wasteful number, since it uses less digits than its factorization.

204352320521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17896.

The product of its (nonzero) digits is 14400, while the sum is 29.

Adding to 204352320521 its reverse (125023253402), we get a palindrome (329375573923).

The spelling of 204352320521 in words is "two hundred four billion, three hundred fifty-two million, three hundred twenty thousand, five hundred twenty-one".