204143040002521 has 2 divisors, whose sum is σ = 204143040002522. Its totient is φ = 204143040002520.

The previous prime is 204143040002519. The next prime is 204143040002599. The reversal of 204143040002521 is 125200040341402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 156349115713296 + 47793924289225 = 12503964^2 + 6913315^2 .

It is a cyclic number.

It is not a de Polignac number, because 204143040002521 - 2¹ = 204143040002519 is a prime.

Together with 204143040002519, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 204143040002521.

It is not a weakly prime, because it can be changed into another prime (204143040003521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102071520001260 + 102071520001261.

It is an arithmetic number, because the mean of its divisors is an integer number (102071520001261).

Almost surely, 2^{204143040002521} is an apocalyptic number.

It is an amenable number.

204143040002521 is a deficient number, since it is larger than the sum of its proper divisors (1).

204143040002521 is an equidigital number, since it uses as much as digits as its factorization.

204143040002521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7680, while the sum is 28.

Adding to 204143040002521 its reverse (125200040341402), we get a palindrome (329343080343923).

The spelling of 204143040002521 in words is "two hundred four trillion, one hundred forty-three billion, forty million, two thousand, five hundred twenty-one".