204021132455 has 16 divisors (see below), whose sum is σ = 279969349440. Its totient is φ = 139815735552.

The previous prime is 204021132451. The next prime is 204021132493. The reversal of 204021132455 is 554231120402.

It is a cyclic number.

It is not a de Polignac number, because 204021132455 - 2² = 204021132451 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204021132451) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1700960 + ... + 1816949.

It is an arithmetic number, because the mean of its divisors is an integer number (17498084340).

Almost surely, 2^204021132455 is an apocalyptic number.

204021132455 is a deficient number, since it is larger than the sum of its proper divisors (75948216985).

204021132455 is a wasteful number, since it uses less digits than its factorization.

204021132455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3519578.

The product of its (nonzero) digits is 9600, while the sum is 29.

Adding to 204021132455 its reverse (554231120402), we get a palindrome (758252252857).

The spelling of 204021132455 in words is "two hundred four billion, twenty-one million, one hundred thirty-two thousand, four hundred fifty-five".