204020221541551 has 8 divisors (see below), whose sum is σ = 204297235603200. Its totient is φ = 203743299353880.

The previous prime is 204020221541519. The next prime is 204020221541579. The reversal of 204020221541551 is 155145122020402.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 204020221541551 - 2⁵ = 204020221541519 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 (204020221541051) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18523591 + ... + 27407368.

It is an arithmetic number, because the mean of its divisors is an integer number (25537154450400).

Almost surely, 2^{204020221541551} is an apocalyptic number.

204020221541551 is a deficient number, since it is larger than the sum of its proper divisors (277014061649).

204020221541551 is an equidigital number, since it uses as much as digits as its factorization.

204020221541551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45936989.

The product of its (nonzero) digits is 32000, while the sum is 34.

Adding to 204020221541551 its reverse (155145122020402), we get a palindrome (359165343561953).

The spelling of 204020221541551 in words is "two hundred four trillion, twenty billion, two hundred twenty-one million, five hundred forty-one thousand, five hundred fifty-one".