21526525 has 12 divisors (see below), whose sum is σ = 28098400. Its totient is φ = 16314480.

The previous prime is 21526523. The next prime is 21526537. The reversal of 21526525 is 52562512.

It is not a de Polignac number, because 21526525 - 2¹ = 21526523 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21526493 and 21526502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21526523) 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, 22185 + ... + 23134.

Almost surely, 2^21526525 is an apocalyptic number.

21526525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21526525 is a deficient number, since it is larger than the sum of its proper divisors (6571875).

21526525 is a wasteful number, since it uses less digits than its factorization.

21526525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45348 (or 45343 counting only the distinct ones).

The product of its digits is 6000, while the sum is 28.

The square root of 21526525 is about 4639.6686304089. The cubic root of 21526525 is about 278.1791928232.

The spelling of 21526525 in words is "twenty-one million, five hundred twenty-six thousand, five hundred twenty-five".