21525104 has 20 divisors (see below), whose sum is σ = 41835864. Its totient is φ = 10728768.

The previous prime is 21525089. The next prime is 21525109. The reversal of 21525104 is 40152512.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21525109) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3614 + ... + 7490.

Almost surely, 2^21525104 is an apocalyptic number.

It is an amenable number.

21525104 is a deficient number, since it is larger than the sum of its proper divisors (20310760).

21525104 is a wasteful number, since it uses less digits than its factorization.

21525104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4232 (or 4226 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 20.

The square root of 21525104 is about 4639.5154919453. The cubic root of 21525104 is about 278.1730716722.

Adding to 21525104 its reverse (40152512), we get a palindrome (61677616).

The spelling of 21525104 in words is "twenty-one million, five hundred twenty-five thousand, one hundred four".