21525360612415 has 32 divisors (see below), whose sum is σ = 28211305086720. Its totient is φ = 15636671635200.

The previous prime is 21525360612407. The next prime is 21525360612421. The reversal of 21525360612415 is 51421606352512.

It is not a de Polignac number, because 21525360612415 - 2³ = 21525360612407 is a prime.

It is a super-2 number, since 2×21525360612415² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 789647056 + ... + 789674314.

It is an arithmetic number, because the mean of its divisors is an integer number (881603283960).

Almost surely, 2^{21525360612415} is an apocalyptic number.

21525360612415 is a deficient number, since it is larger than the sum of its proper divisors (6685944474305).

21525360612415 is a wasteful number, since it uses less digits than its factorization.

21525360612415 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43383.

The product of its (nonzero) digits is 432000, while the sum is 43.

Adding to 21525360612415 its reverse (51421606352512), we get a palindrome (72946966964927).

The spelling of 21525360612415 in words is "twenty-one trillion, five hundred twenty-five billion, three hundred sixty million, six hundred twelve thousand, four hundred fifteen".