2505207301621 has 2 divisors, whose sum is σ = 2505207301622. Its totient is φ = 2505207301620.

The previous prime is 2505207301567. The next prime is 2505207301651. The reversal of 2505207301621 is 1261037025052.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1906293830596 + 598913471025 = 1380686^2 + 773895^2 .

It is a cyclic number.

It is not a de Polignac number, because 2505207301621 - 2⁹ = 2505207301109 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2505207301651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1252603650810 + 1252603650811.

It is an arithmetic number, because the mean of its divisors is an integer number (1252603650811).

Almost surely, 2^{2505207301621} is an apocalyptic number.

It is an amenable number.

2505207301621 is a deficient number, since it is larger than the sum of its proper divisors (1).

2505207301621 is an equidigital number, since it uses as much as digits as its factorization.

2505207301621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 25200, while the sum is 34.

The spelling of 2505207301621 in words is "two trillion, five hundred five billion, two hundred seven million, three hundred one thousand, six hundred twenty-one".