21498275 has 12 divisors (see below), whose sum is σ = 26810784. Its totient is φ = 17100000.

The previous prime is 21498259. The next prime is 21498277. The reversal of 21498275 is 57289412.

It is not a de Polignac number, because 21498275 - 2⁴ = 21498259 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21498277) 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, 2150 + ... + 6900.

It is an arithmetic number, because the mean of its divisors is an integer number (2234232).

Almost surely, 2^21498275 is an apocalyptic number.

21498275 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21498275 is a deficient number, since it is larger than the sum of its proper divisors (5312509).

21498275 is a wasteful number, since it uses less digits than its factorization.

21498275 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4942 (or 4937 counting only the distinct ones).

The product of its digits is 40320, while the sum is 38.

The square root of 21498275 is about 4636.6232324829. The cubic root of 21498275 is about 278.0574515081.

It can be divided in two parts, 214 and 98275, that added together give a palindrome (98489).

The spelling of 21498275 in words is "twenty-one million, four hundred ninety-eight thousand, two hundred seventy-five".