204515642645321 has 32 divisors (see below), whose sum is σ = 260508519048960. Its totient is φ = 156302611255296.

The previous prime is 204515642645263. The next prime is 204515642645329. The reversal of 204515642645321 is 123546246515402.

It is a cyclic number.

It is not a de Polignac number, because 204515642645321 - 2¹⁰ = 204515642644297 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 204515642645321.

It is not an unprimeable number, because it can be changed into a prime (204515642645329) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 363190241 + ... + 363752913.

It is an arithmetic number, because the mean of its divisors is an integer number (8140891220280).

Almost surely, 2^{204515642645321} is an apocalyptic number.

It is an amenable number.

204515642645321 is a deficient number, since it is larger than the sum of its proper divisors (55992876403639).

204515642645321 is a wasteful number, since it uses less digits than its factorization.

204515642645321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 723473.

The product of its (nonzero) digits is 6912000, while the sum is 50.

The spelling of 204515642645321 in words is "two hundred four trillion, five hundred fifteen billion, six hundred forty-two million, six hundred forty-five thousand, three hundred twenty-one".