204240124121 has 16 divisors (see below), whose sum is σ = 229313790720. Its totient is φ = 180326688720.

The previous prime is 204240124111. The next prime is 204240124139. The reversal of 204240124121 is 121421042402.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-204240124121 is a prime.

It is a super-2 number, since 2×204240124121² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (204240124111) 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, 1841915 + ... + 1949648.

It is an arithmetic number, because the mean of its divisors is an integer number (14332111920).

Almost surely, 2^204240124121 is an apocalyptic number.

It is an amenable number.

204240124121 is a deficient number, since it is larger than the sum of its proper divisors (25073666599).

204240124121 is a wasteful number, since it uses less digits than its factorization.

204240124121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3791716.

The product of its (nonzero) digits is 1024, while the sum is 23.

Adding to 204240124121 its reverse (121421042402), we get a palindrome (325661166523).

The spelling of 204240124121 in words is "two hundred four billion, two hundred forty million, one hundred twenty-four thousand, one hundred twenty-one".