21498025 has 12 divisors (see below), whose sum is σ = 28061200. Its totient is φ = 16292880.

The previous prime is 21497977. The next prime is 21498041. The reversal of 21498025 is 52089412.

It is not a de Polignac number, because 21498025 - 2⁷ = 21497897 is a prime.

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, 22155 + ... + 23104.

Almost surely, 2^21498025 is an apocalyptic number.

21498025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21498025 is a deficient number, since it is larger than the sum of its proper divisors (6563175).

21498025 is a wasteful number, since it uses less digits than its factorization.

21498025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45288 (or 45283 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 31.

The square root of 21498025 is about 4636.5962731297. The cubic root of 21498025 is about 278.0563736753.

The spelling of 21498025 in words is "twenty-one million, four hundred ninety-eight thousand, twenty-five".