21298525 has 12 divisors (see below), whose sum is σ = 27800800. Its totient is φ = 16141680.

The previous prime is 21298517. The next prime is 21298531. The reversal of 21298525 is 52589212.

It is a happy number.

It is not a de Polignac number, because 21298525 - 2³ = 21298517 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

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, 21945 + ... + 22894.

Almost surely, 2^21298525 is an apocalyptic number.

21298525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21298525 is a deficient number, since it is larger than the sum of its proper divisors (6502275).

21298525 is a wasteful number, since it uses less digits than its factorization.

21298525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44868 (or 44863 counting only the distinct ones).

The product of its digits is 14400, while the sum is 34.

The square root of 21298525 is about 4615.0325025941. The cubic root of 21298525 is about 277.1935854360.

The spelling of 21298525 in words is "twenty-one million, two hundred ninety-eight thousand, five hundred twenty-five".