20002502521 has 2 divisors, whose sum is σ = 20002502522. Its totient is φ = 20002502520.

The previous prime is 20002502503. The next prime is 20002502537. The reversal of 20002502521 is 12520520002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14783884921 + 5218617600 = 121589^2 + 72240^2 .

It is a cyclic number.

It is not a de Polignac number, because 20002502521 - 2⁷ = 20002502393 is a prime.

It is a super-2 number, since 2×20002502521² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20002502591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10001251260 + 10001251261.

It is an arithmetic number, because the mean of its divisors is an integer number (10001251261).

Almost surely, 2^20002502521 is an apocalyptic number.

It is an amenable number.

20002502521 is a deficient number, since it is larger than the sum of its proper divisors (1).

20002502521 is an equidigital number, since it uses as much as digits as its factorization.

20002502521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 400, while the sum is 19.

The spelling of 20002502521 in words is "twenty billion, two million, five hundred two thousand, five hundred twenty-one".