20202986252521 has 2 divisors, whose sum is σ = 20202986252522. Its totient is φ = 20202986252520.

The previous prime is 20202986252509. The next prime is 20202986252573. The reversal of 20202986252521 is 12525268920202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17464341889296 + 2738644363225 = 4179036^2 + 1654885^2 .

It is a cyclic number.

It is not a de Polignac number, because 20202986252521 - 2¹⁷ = 20202986121449 is a prime.

It is not a weakly prime, because it can be changed into another prime (20202986256521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10101493126260 + 10101493126261.

It is an arithmetic number, because the mean of its divisors is an integer number (10101493126261).

Almost surely, 2^{20202986252521} is an apocalyptic number.

It is an amenable number.

20202986252521 is a deficient number, since it is larger than the sum of its proper divisors (1).

20202986252521 is an equidigital number, since it uses as much as digits as its factorization.

20202986252521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 691200, while the sum is 46.

The spelling of 20202986252521 in words is "twenty trillion, two hundred two billion, nine hundred eighty-six million, two hundred fifty-two thousand, five hundred twenty-one".