204701745221 has 4 divisors (see below), whose sum is σ = 207168031392. Its totient is φ = 202235459052.

The previous prime is 204701745191. The next prime is 204701745257. The reversal of 204701745221 is 122547107402.

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 204701745221 - 2²⁶ = 204634636357 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204701741221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1233142961 + ... + 1233143126.

It is an arithmetic number, because the mean of its divisors is an integer number (51792007848).

Almost surely, 2^204701745221 is an apocalyptic number.

It is an amenable number.

204701745221 is a deficient number, since it is larger than the sum of its proper divisors (2466286171).

204701745221 is an equidigital number, since it uses as much as digits as its factorization.

204701745221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2466286170.

The product of its (nonzero) digits is 31360, while the sum is 35.

The spelling of 204701745221 in words is "two hundred four billion, seven hundred one million, seven hundred forty-five thousand, two hundred twenty-one".