204421144130021 has 64 divisors (see below), whose sum is σ = 259749140141568. Its totient is φ = 156565578129408.

The previous prime is 204421144129987. The next prime is 204421144130033. The reversal of 204421144130021 is 120031441124402.

It is a de Polignac number, because none of the positive numbers 2^k-204421144130021 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204421144130821) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 7948859255 + ... + 7948884971.

It is an arithmetic number, because the mean of its divisors is an integer number (4058580314712).

Almost surely, 2^{204421144130021} is an apocalyptic number.

It is an amenable number.

204421144130021 is a deficient number, since it is larger than the sum of its proper divisors (55327996011547).

204421144130021 is a wasteful number, since it uses less digits than its factorization.

204421144130021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43870.

The product of its (nonzero) digits is 6144, while the sum is 29.

Adding to 204421144130021 its reverse (120031441124402), we get a palindrome (324452585254423).

The spelling of 204421144130021 in words is "two hundred four trillion, four hundred twenty-one billion, one hundred forty-four million, one hundred thirty thousand, twenty-one".