21715102733453 has 4 divisors (see below), whose sum is σ = 21721384224540. Its totient is φ = 21708821242368.

The previous prime is 21715102733431. The next prime is 21715102733461. The reversal of 21715102733453 is 35433720151712.

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 7926037963684 + 13789064769769 = 2815322^2 + 3713363^2 .

It is a cyclic number.

It is not a de Polignac number, because 21715102733453 - 2¹⁰ = 21715102732429 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 (21715102333453) 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, 3140740358 + ... + 3140747271.

It is an arithmetic number, because the mean of its divisors is an integer number (5430346056135).

Almost surely, 2^{21715102733453} is an apocalyptic number.

It is an amenable number.

21715102733453 is a deficient number, since it is larger than the sum of its proper divisors (6281491087).

21715102733453 is an equidigital number, since it uses as much as digits as its factorization.

21715102733453 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6281491086.

The product of its (nonzero) digits is 529200, while the sum is 44.

The spelling of 21715102733453 in words is "twenty-one trillion, seven hundred fifteen billion, one hundred two million, seven hundred thirty-three thousand, four hundred fifty-three".