21010528000013 has 4 divisors (see below), whose sum is σ = 21010584538620. Its totient is φ = 21010471461408.

The previous prime is 21010528000009. The next prime is 21010528000037. The reversal of 21010528000013 is 31000082501012.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6875319258889 + 14135208741124 = 2622083^2 + 3759682^2 .

It is a cyclic number.

It is not a de Polignac number, because 21010528000013 - 2² = 21010528000009 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21010528000043) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27708170 + ... + 28456347.

It is an arithmetic number, because the mean of its divisors is an integer number (5252646134655).

Almost surely, 2^{21010528000013} is an apocalyptic number.

It is an amenable number.

21010528000013 is a deficient number, since it is larger than the sum of its proper divisors (56538607).

21010528000013 is an equidigital number, since it uses as much as digits as its factorization.

21010528000013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56538606.

The product of its (nonzero) digits is 480, while the sum is 23.

The spelling of 21010528000013 in words is "twenty-one trillion, ten billion, five hundred twenty-eight million, thirteen", and thus it is an aban number.