10021520521 has 2 divisors, whose sum is σ = 10021520522. Its totient is φ = 10021520520.

The previous prime is 10021520501. The next prime is 10021520533. The reversal of 10021520521 is 12502512001.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5189185296 + 4832335225 = 72036^2 + 69515^2 .

It is a cyclic number.

It is not a de Polignac number, because 10021520521 - 2³¹ = 7874036873 is a prime.

It is a super-2 number, since 2×10021520521² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (10021520501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5010760260 + 5010760261.

It is an arithmetic number, because the mean of its divisors is an integer number (5010760261).

Almost surely, 2^10021520521 is an apocalyptic number.

It is an amenable number.

10021520521 is a deficient number, since it is larger than the sum of its proper divisors (1).

10021520521 is an equidigital number, since it uses as much as digits as its factorization.

10021520521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 200, while the sum is 19.

The spelling of 10021520521 in words is "ten billion, twenty-one million, five hundred twenty thousand, five hundred twenty-one".