204020511522251 has 4 divisors (see below), whose sum is σ = 208765174580952. Its totient is φ = 199275848463552.

The previous prime is 204020511522221. The next prime is 204020511522259. The reversal of 204020511522251 is 152225115020402.

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

It is a cyclic number.

It is not a de Polignac number, because 204020511522251 - 2⁶ = 204020511522187 is a prime.

It is a super-3 number, since 3×204020511522251³ (a number of 44 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (204020511522259) 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, 2372331529286 + ... + 2372331529371.

It is an arithmetic number, because the mean of its divisors is an integer number (52191293645238).

Almost surely, 2^{204020511522251} is an apocalyptic number.

204020511522251 is a deficient number, since it is larger than the sum of its proper divisors (4744663058701).

204020511522251 is an equidigital number, since it uses as much as digits as its factorization.

204020511522251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4744663058700.

The product of its (nonzero) digits is 16000, while the sum is 32.

Adding to 204020511522251 its reverse (152225115020402), we get a palindrome (356245626542653).

The spelling of 204020511522251 in words is "two hundred four trillion, twenty billion, five hundred eleven million, five hundred twenty-two thousand, two hundred fifty-one".