204120323043021 has 36 divisors (see below), whose sum is σ = 374157475271424. Its totient is φ = 106036531448400.

The previous prime is 204120323043017. The next prime is 204120323043121. The reversal of 204120323043021 is 120340323021402.

204120323043021 is a `hidden beast` number, since 2 + 0 + 4 + 1 + 20 + 32 + 304 + 302 + 1 = 666.

It is not a de Polignac number, because 204120323043021 - 2² = 204120323043017 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204120323043011) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 21038989485 + ... + 21038999186.

It is an arithmetic number, because the mean of its divisors is an integer number (10393263201984).

Almost surely, 2^{204120323043021} is an apocalyptic number.

204120323043021 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

204120323043021 is a deficient number, since it is larger than the sum of its proper divisors (170037152228403).

204120323043021 is a wasteful number, since it uses less digits than its factorization.

204120323043021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42077988702 (or 42077988692 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 27.

Adding to 204120323043021 its reverse (120340323021402), we get a palindrome (324460646064423).

The spelling of 204120323043021 in words is "two hundred four trillion, one hundred twenty billion, three hundred twenty-three million, forty-three thousand, twenty-one".