204305133021 has 16 divisors (see below), whose sum is σ = 298812940608. Its totient is φ = 123137193600.

The previous prime is 204305133013. The next prime is 204305133059. The reversal of 204305133021 is 120331503402.

It is not a de Polignac number, because 204305133021 - 2³ = 204305133013 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 204305132982 and 204305133000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204305133521) 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, 17096416 + ... + 17108361.

It is an arithmetic number, because the mean of its divisors is an integer number (18675808788).

Almost surely, 2^204305133021 is an apocalyptic number.

It is an amenable number.

204305133021 is a deficient number, since it is larger than the sum of its proper divisors (94507807587).

204305133021 is a wasteful number, since it uses less digits than its factorization.

204305133021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34204972.

The product of its (nonzero) digits is 2160, while the sum is 24.

Adding to 204305133021 its reverse (120331503402), we get a palindrome (324636636423).

The spelling of 204305133021 in words is "two hundred four billion, three hundred five million, one hundred thirty-three thousand, twenty-one".