130021761794521 has 2 divisors, whose sum is σ = 130021761794522. Its totient is φ = 130021761794520.

The previous prime is 130021761794503. The next prime is 130021761794527. The reversal of 130021761794521 is 125497167120031.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 88322197244121 + 41699564550400 = 9397989^2 + 6457520^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-130021761794521 is a prime.

It is not a weakly prime, because it can be changed into another prime (130021761794527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65010880897260 + 65010880897261.

It is an arithmetic number, because the mean of its divisors is an integer number (65010880897261).

Almost surely, 2^{130021761794521} is an apocalyptic number.

It is an amenable number.

130021761794521 is a deficient number, since it is larger than the sum of its proper divisors (1).

130021761794521 is an equidigital number, since it uses as much as digits as its factorization.

130021761794521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 635040, while the sum is 49.

The spelling of 130021761794521 in words is "one hundred thirty trillion, twenty-one billion, seven hundred sixty-one million, seven hundred ninety-four thousand, five hundred twenty-one".