21527322517 has 8 divisors (see below), whose sum is σ = 21981513816. Its totient is φ = 21077436672.

The previous prime is 21527322503. The next prime is 21527322589. The reversal of 21527322517 is 71522372512.

It can be written as a sum of positive squares in 4 ways, for example, as 8239919076 + 13287403441 = 90774^2 + 115271^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21527322517 - 2¹¹ = 21527320469 is a prime.

It is a super-2 number, since 2×21527322517² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21527325517) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1066258 + ... + 1086259.

It is an arithmetic number, because the mean of its divisors is an integer number (2747689227).

Almost surely, 2^21527322517 is an apocalyptic number.

It is an amenable number.

21527322517 is a deficient number, since it is larger than the sum of its proper divisors (454191299).

21527322517 is a wasteful number, since it uses less digits than its factorization.

21527322517 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2152727.

The product of its digits is 58800, while the sum is 37.

The spelling of 21527322517 in words is "twenty-one billion, five hundred twenty-seven million, three hundred twenty-two thousand, five hundred seventeen".