21226199 has 2 divisors, whose sum is σ = 21226200. Its totient is φ = 21226198.

The previous prime is 21226193. The next prime is 21226213. The reversal of 21226199 is 99162212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21226199 - 2⁸ = 21225943 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21226193) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10613099 + 10613100.

It is an arithmetic number, because the mean of its divisors is an integer number (10613100).

Almost surely, 2^21226199 is an apocalyptic number.

21226199 is a deficient number, since it is larger than the sum of its proper divisors (1).

21226199 is an equidigital number, since it uses as much as digits as its factorization.

21226199 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3888, while the sum is 32.

The square root of 21226199 is about 4607.1899244550. The cubic root of 21226199 is about 276.8794629062.

The spelling of 21226199 in words is "twenty-one million, two hundred twenty-six thousand, one hundred ninety-nine".