21522527017 has 4 divisors (see below), whose sum is σ = 22788558036. Its totient is φ = 20256496000.

The previous prime is 21522526997. The next prime is 21522527021. The reversal of 21522527017 is 71072522512.

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 10035832041 + 11486694976 = 100179^2 + 107176^2 .

It is a cyclic number.

It is not a de Polignac number, because 21522527017 - 2²³ = 21514138409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21522527057) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 633015484 + ... + 633015517.

It is an arithmetic number, because the mean of its divisors is an integer number (5697139509).

Almost surely, 2^21522527017 is an apocalyptic number.

It is an amenable number.

21522527017 is a deficient number, since it is larger than the sum of its proper divisors (1266031019).

21522527017 is a wasteful number, since it uses less digits than its factorization.

21522527017 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1266031018.

The product of its (nonzero) digits is 19600, while the sum is 34.

It can be divided in two parts, 215225 and 27017, that added together give a palindrome (242242).

The spelling of 21522527017 in words is "twenty-one billion, five hundred twenty-two million, five hundred twenty-seven thousand, seventeen".