21268199 has 8 divisors (see below), whose sum is σ = 21769440. Its totient is φ = 20772000.

The previous prime is 21268193. The next prime is 21268213. The reversal of 21268199 is 99186212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21268199 - 2⁴ = 21268183 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21268193) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8057 + ... + 10365.

It is an arithmetic number, because the mean of its divisors is an integer number (2721180).

Almost surely, 2^21268199 is an apocalyptic number.

21268199 is a deficient number, since it is larger than the sum of its proper divisors (501241).

21268199 is a wasteful number, since it uses less digits than its factorization.

21268199 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2521.

The product of its digits is 15552, while the sum is 38.

The square root of 21268199 is about 4611.7457648921. The cubic root of 21268199 is about 277.0619618368.

The spelling of 21268199 in words is "twenty-one million, two hundred sixty-eight thousand, one hundred ninety-nine".