204121220415 has 32 divisors (see below), whose sum is σ = 379369099776. Its totient is φ = 91782840960.

The previous prime is 204121220411. The next prime is 204121220497. The reversal of 204121220415 is 514022121402.

It is not a de Polignac number, because 204121220415 - 2² = 204121220411 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204121220411) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 15928117 + ... + 15940926.

It is an arithmetic number, because the mean of its divisors is an integer number (11855284368).

Almost surely, 2^204121220415 is an apocalyptic number.

204121220415 is a deficient number, since it is larger than the sum of its proper divisors (175247879361).

204121220415 is a wasteful number, since it uses less digits than its factorization.

204121220415 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31869119.

The product of its (nonzero) digits is 1280, while the sum is 24.

Adding to 204121220415 its reverse (514022121402), we get a palindrome (718143341817).

The spelling of 204121220415 in words is "two hundred four billion, one hundred twenty-one million, two hundred twenty thousand, four hundred fifteen".