21098075 has 12 divisors (see below), whose sum is σ = 27539160. Its totient is φ = 15989760.

The previous prime is 21098069. The next prime is 21098087. The reversal of 21098075 is 57089012.

It is not a de Polignac number, because 21098075 - 2¹⁴ = 21081691 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, 21734 + ... + 22683.

It is an arithmetic number, because the mean of its divisors is an integer number (2294930).

Almost surely, 2^21098075 is an apocalyptic number.

21098075 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21098075 is a deficient number, since it is larger than the sum of its proper divisors (6441085).

21098075 is a wasteful number, since it uses less digits than its factorization.

21098075 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44446 (or 44441 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 32.

The square root of 21098075 is about 4593.2640899474. The cubic root of 21098075 is about 276.3212451801.

The spelling of 21098075 in words is "twenty-one million, ninety-eight thousand, seventy-five".