204420132200021 has 2 divisors, whose sum is σ = 204420132200022. Its totient is φ = 204420132200020.

The previous prime is 204420132199999. The next prime is 204420132200047. The reversal of 204420132200021 is 120002231024402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 202347381712996 + 2072750487025 = 14224886^2 + 1439705^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-204420132200021 is a prime.

It is a super-3 number, since 3×204420132200021³ (a number of 44 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 204420132200021.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (204420132200321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102210066100010 + 102210066100011.

It is an arithmetic number, because the mean of its divisors is an integer number (102210066100011).

Almost surely, 2^{204420132200021} is an apocalyptic number.

It is an amenable number.

204420132200021 is a deficient number, since it is larger than the sum of its proper divisors (1).

204420132200021 is an equidigital number, since it uses as much as digits as its factorization.

204420132200021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1536, while the sum is 23.

Adding to 204420132200021 its reverse (120002231024402), we get a palindrome (324422363224423).

The spelling of 204420132200021 in words is "two hundred four trillion, four hundred twenty billion, one hundred thirty-two million, two hundred thousand, twenty-one".