21192255 has 48 divisors (see below), whose sum is σ = 42868800. Its totient is φ = 9680832.

The previous prime is 21192247. The next prime is 21192271. The reversal of 21192255 is 55229112.

It is not a de Polignac number, because 21192255 - 2³ = 21192247 is a prime.

It is a super-2 number, since 2×21192255² = 898223343970050, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 14749 + ... + 16121.

It is an arithmetic number, because the mean of its divisors is an integer number (893100).

Almost surely, 2^21192255 is an apocalyptic number.

21192255 is an abundant number, since it is smaller than the sum of its proper divisors (21676545).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21192255 is a wasteful number, since it uses less digits than its factorization.

21192255 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1405 (or 1388 counting only the distinct ones).

The product of its digits is 1800, while the sum is 27.

The square root of 21192255 is about 4603.5046432039. The cubic root of 21192255 is about 276.7317930262.

The spelling of 21192255 in words is "twenty-one million, one hundred ninety-two thousand, two hundred fifty-five".