204415254525421 has 4 divisors (see below), whose sum is σ = 205153215733372. Its totient is φ = 203677293317472.

The previous prime is 204415254525367. The next prime is 204415254525439. The reversal of 204415254525421 is 124525452514402.

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

It can be written as a sum of positive squares in 2 ways, for example, as 16234090014025 + 188181164511396 = 4029155^2 + 13717914^2 .

It is a cyclic number.

It is not a de Polignac number, because 204415254525421 - 2²¹ = 204415252428269 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 (204415254525451) 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, 368980603560 + ... + 368980604113.

It is an arithmetic number, because the mean of its divisors is an integer number (51288303933343).

Almost surely, 2^{204415254525421} is an apocalyptic number.

It is an amenable number.

204415254525421 is a deficient number, since it is larger than the sum of its proper divisors (737961207951).

204415254525421 is an equidigital number, since it uses as much as digits as its factorization.

204415254525421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 737961207950.

The product of its (nonzero) digits is 2560000, while the sum is 46.

The spelling of 204415254525421 in words is "two hundred four trillion, four hundred fifteen billion, two hundred fifty-four million, five hundred twenty-five thousand, four hundred twenty-one".