204034034044021 has 4 divisors (see below), whose sum is σ = 204827940791532. Its totient is φ = 203240127296512.

The previous prime is 204034034043937. The next prime is 204034034044037. The reversal of 204034034044021 is 120440430430402.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 173603971884996 + 30430062159025 = 13175886^2 + 5516345^2 .

It is a cyclic number.

It is not a de Polignac number, because 204034034044021 - 2⁷ = 204034034043893 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204034034044921) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 396953373370 + ... + 396953373883.

It is an arithmetic number, because the mean of its divisors is an integer number (51206985197883).

Almost surely, 2^{204034034044021} is an apocalyptic number.

It is an amenable number.

204034034044021 is a deficient number, since it is larger than the sum of its proper divisors (793906747511).

204034034044021 is an equidigital number, since it uses as much as digits as its factorization.

204034034044021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 793906747510.

The product of its (nonzero) digits is 36864, while the sum is 31.

Adding to 204034034044021 its reverse (120440430430402), we get a palindrome (324474464474423).

The spelling of 204034034044021 in words is "two hundred four trillion, thirty-four billion, thirty-four million, forty-four thousand, twenty-one".