21936199 has 4 divisors (see below), whose sum is σ = 21945664. Its totient is φ = 21926736.

The previous prime is 21936191. The next prime is 21936217. The reversal of 21936199 is 99163912.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 21936199 - 2³ = 21936191 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 (21936191) 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 in 3 ways as a sum of consecutive naturals, for example, 1354 + ... + 6760.

It is an arithmetic number, because the mean of its divisors is an integer number (5486416).

Almost surely, 2^21936199 is an apocalyptic number.

21936199 is a deficient number, since it is larger than the sum of its proper divisors (9465).

21936199 is an equidigital number, since it uses as much as digits as its factorization.

21936199 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9464.

The product of its digits is 26244, while the sum is 40.

The square root of 21936199 is about 4683.6096122542. The cubic root of 21936199 is about 279.9328027522.

The spelling of 21936199 in words is "twenty-one million, nine hundred thirty-six thousand, one hundred ninety-nine".