21227199 has 16 divisors (see below), whose sum is σ = 34049280. Its totient is φ = 11491200.

The previous prime is 21227177. The next prime is 21227201. The reversal of 21227199 is 99172212.

It is not a de Polignac number, because 21227199 - 2⁸ = 21226943 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21227099) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26202 + ... + 26999.

It is an arithmetic number, because the mean of its divisors is an integer number (2128080).

Almost surely, 2^21227199 is an apocalyptic number.

21227199 is a deficient number, since it is larger than the sum of its proper divisors (12822081).

21227199 is a wasteful number, since it uses less digits than its factorization.

21227199 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53230.

The product of its digits is 4536, while the sum is 33.

The square root of 21227199 is about 4607.2984491999. The cubic root of 21227199 is about 276.8838109153.

The spelling of 21227199 in words is "twenty-one million, two hundred twenty-seven thousand, one hundred ninety-nine".