204112043021 has 4 divisors (see below), whose sum is σ = 204228880512. Its totient is φ = 203995205532.

The previous prime is 204112042987. The next prime is 204112043041. The reversal of 204112043021 is 120340211402.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-204112043021 is a prime.

It is a super-2 number, since 2×204112043021² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 204112042984 and 204112043002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204112043041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 58416125 + ... + 58419618.

It is an arithmetic number, because the mean of its divisors is an integer number (51057220128).

Almost surely, 2^204112043021 is an apocalyptic number.

It is an amenable number.

204112043021 is a deficient number, since it is larger than the sum of its proper divisors (116837491).

204112043021 is a wasteful number, since it uses less digits than its factorization.

204112043021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116837490.

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 204112043021 its reverse (120340211402), we get a palindrome (324452254423).

The spelling of 204112043021 in words is "two hundred four billion, one hundred twelve million, forty-three thousand, twenty-one".