21652615647525 has 12 divisors (see below), whose sum is σ = 35798991204032. Its totient is φ = 11548061678640.

The previous prime is 21652615647503. The next prime is 21652615647527. The reversal of 21652615647525 is 52574651625612.

It is not a de Polignac number, because 21652615647525 - 2²⁹ = 21652078776613 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 (21652615647527) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 144350770909 + ... + 144350771058.

Almost surely, 2^{21652615647525} is an apocalyptic number.

21652615647525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21652615647525 is a deficient number, since it is larger than the sum of its proper divisors (14146375556507).

21652615647525 is a wasteful number, since it uses less digits than its factorization.

21652615647525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 288701541980 (or 288701541975 counting only the distinct ones).

The product of its digits is 30240000, while the sum is 57.

The spelling of 21652615647525 in words is "twenty-one trillion, six hundred fifty-two billion, six hundred fifteen million, six hundred forty-seven thousand, five hundred twenty-five".