21525435 has 12 divisors (see below), whose sum is σ = 37310832. Its totient is φ = 11480208.

The previous prime is 21525419. The next prime is 21525463. The reversal of 21525435 is 53452512.

It is a happy number.

It is not a de Polignac number, because 21525435 - 2⁴ = 21525419 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21525399 and 21525408.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 239127 + ... + 239216.

It is an arithmetic number, because the mean of its divisors is an integer number (3109236).

Almost surely, 2^21525435 is an apocalyptic number.

21525435 is a deficient number, since it is larger than the sum of its proper divisors (15785397).

21525435 is a wasteful number, since it uses less digits than its factorization.

21525435 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 478354 (or 478351 counting only the distinct ones).

The product of its digits is 6000, while the sum is 27.

The square root of 21525435 is about 4639.5511636364. The cubic root of 21525435 is about 278.1744975238.

Adding to 21525435 its reverse (53452512), we get a palindrome (74977947).

The spelling of 21525435 in words is "twenty-one million, five hundred twenty-five thousand, four hundred thirty-five".