21874199 has 2 divisors, whose sum is σ = 21874200. Its totient is φ = 21874198.

The previous prime is 21874183. The next prime is 21874241. The reversal of 21874199 is 99147812.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21874199 - 2⁴ = 21874183 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 (21874169) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10937099 + 10937100.

It is an arithmetic number, because the mean of its divisors is an integer number (10937100).

Almost surely, 2^21874199 is an apocalyptic number.

21874199 is a deficient number, since it is larger than the sum of its proper divisors (1).

21874199 is an equidigital number, since it uses as much as digits as its factorization.

21874199 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 36288, while the sum is 41.

The square root of 21874199 is about 4676.9861021816. The cubic root of 21874199 is about 279.6688218793.

The spelling of 21874199 in words is "twenty-one million, eight hundred seventy-four thousand, one hundred ninety-nine".