21333199 has 2 divisors, whose sum is σ = 21333200. Its totient is φ = 21333198.

The previous prime is 21333197. The next prime is 21333251. The reversal of 21333199 is 99133312.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21333199 - 2¹ = 21333197 is a prime.

Together with 21333197, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 21333199.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21333197) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10666599 + 10666600.

It is an arithmetic number, because the mean of its divisors is an integer number (10666600).

Almost surely, 2^21333199 is an apocalyptic number.

21333199 is a deficient number, since it is larger than the sum of its proper divisors (1).

21333199 is an equidigital number, since it uses as much as digits as its factorization.

21333199 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4374, while the sum is 31.

The square root of 21333199 is about 4618.7876114842. The cubic root of 21333199 is about 277.3439276045.

The spelling of 21333199 in words is "twenty-one million, three hundred thirty-three thousand, one hundred ninety-nine".