204444120421 has 4 divisors (see below), whose sum is σ = 204445044972. Its totient is φ = 204443195872.

The previous prime is 204444120409. The next prime is 204444120431. The reversal of 204444120421 is 124021444402.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 94027476321 + 110416644100 = 306639^2 + 332290^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-204444120421 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 204444120421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204444120431) 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, 86841 + ... + 645313.

It is an arithmetic number, because the mean of its divisors is an integer number (51111261243).

Almost surely, 2^204444120421 is an apocalyptic number.

It is an amenable number.

204444120421 is a deficient number, since it is larger than the sum of its proper divisors (924551).

204444120421 is an equidigital number, since it uses as much as digits as its factorization.

204444120421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 924550.

The product of its (nonzero) digits is 8192, while the sum is 28.

Adding to 204444120421 its reverse (124021444402), we get a palindrome (328465564823).

The spelling of 204444120421 in words is "two hundred four billion, four hundred forty-four million, one hundred twenty thousand, four hundred twenty-one".