21199275 has 18 divisors (see below), whose sum is σ = 37970660. Its totient is φ = 11306160.

The previous prime is 21199259. The next prime is 21199327. The reversal of 21199275 is 57299112.

It is not a de Polignac number, because 21199275 - 2⁴ = 21199259 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 46885 + ... + 47334.

Almost surely, 2^21199275 is an apocalyptic number.

21199275 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21199275 is a deficient number, since it is larger than the sum of its proper divisors (16771385).

21199275 is a wasteful number, since it uses less digits than its factorization.

21199275 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94235 (or 94227 counting only the distinct ones).

The product of its digits is 11340, while the sum is 36.

The square root of 21199275 is about 4604.2670426464. The cubic root of 21199275 is about 276.7623457403.

The spelling of 21199275 in words is "twenty-one million, one hundred ninety-nine thousand, two hundred seventy-five".