21465525 has 24 divisors (see below), whose sum is σ = 35622720. Its totient is φ = 11405440.

The previous prime is 21465523. The next prime is 21465541. The reversal of 21465525 is 52556412.

It is not a de Polignac number, because 21465525 - 2¹ = 21465523 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21465492 and 21465501.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21465523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 37441 + ... + 38009.

It is an arithmetic number, because the mean of its divisors is an integer number (1484280).

Almost surely, 2^21465525 is an apocalyptic number.

21465525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21465525 is a deficient number, since it is larger than the sum of its proper divisors (14157195).

21465525 is a wasteful number, since it uses less digits than its factorization.

21465525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1085 (or 1080 counting only the distinct ones).

The product of its digits is 12000, while the sum is 30.

The square root of 21465525 is about 4633.0902214397. The cubic root of 21465525 is about 277.9161842109.

The spelling of 21465525 in words is "twenty-one million, four hundred sixty-five thousand, five hundred twenty-five".