21524525 has 24 divisors (see below), whose sum is σ = 30132000. Its totient is φ = 15108800.

The previous prime is 21524513. The next prime is 21524539. The reversal of 21524525 is 52542512.

It is not a de Polignac number, because 21524525 - 2¹⁶ = 21458989 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21524494 and 21524503.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6626 + ... + 9324.

It is an arithmetic number, because the mean of its divisors is an integer number (1255500).

Almost surely, 2^21524525 is an apocalyptic number.

21524525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21524525 is a deficient number, since it is larger than the sum of its proper divisors (8607475).

21524525 is a wasteful number, since it uses less digits than its factorization.

21524525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2749 (or 2744 counting only the distinct ones).

The product of its digits is 4000, while the sum is 26.

The square root of 21524525 is about 4639.4530927686. The cubic root of 21524525 is about 278.1705774736.

The spelling of 21524525 in words is "twenty-one million, five hundred twenty-four thousand, five hundred twenty-five".