204740269621 has 2 divisors, whose sum is σ = 204740269622. Its totient is φ = 204740269620.

The previous prime is 204740269577. The next prime is 204740269661. The reversal of 204740269621 is 126962047402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 183552264900 + 21188004721 = 428430^2 + 145561^2 .

It is a cyclic number.

It is not a de Polignac number, because 204740269621 - 2¹⁵ = 204740236853 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (204740269661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102370134810 + 102370134811.

It is an arithmetic number, because the mean of its divisors is an integer number (102370134811).

Almost surely, 2^204740269621 is an apocalyptic number.

It is an amenable number.

204740269621 is a deficient number, since it is larger than the sum of its proper divisors (1).

204740269621 is an equidigital number, since it uses as much as digits as its factorization.

204740269621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 290304, while the sum is 43.

The spelling of 204740269621 in words is "two hundred four billion, seven hundred forty million, two hundred sixty-nine thousand, six hundred twenty-one".