204016051660021 has 4 divisors (see below), whose sum is σ = 204029334835200. Its totient is φ = 204002768484844.

The previous prime is 204016051659991. The next prime is 204016051660081. The reversal of 204016051660021 is 120066150610402.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 204016051660021 - 2¹³ = 204016051651829 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 (204016051660081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6641564551 + ... + 6641595268.

It is an arithmetic number, because the mean of its divisors is an integer number (51007333708800).

Almost surely, 2^{204016051660021} is an apocalyptic number.

It is an amenable number.

204016051660021 is a deficient number, since it is larger than the sum of its proper divisors (13283175179).

204016051660021 is a wasteful number, since it uses less digits than its factorization.

204016051660021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13283175178.

The product of its (nonzero) digits is 17280, while the sum is 34.

The spelling of 204016051660021 in words is "two hundred four trillion, sixteen billion, fifty-one million, six hundred sixty thousand, twenty-one".