21919199 has 8 divisors (see below), whose sum is σ = 22318992. Its totient is φ = 21522240.

The previous prime is 21919189. The next prime is 21919213. The reversal of 21919199 is 99191912.

It is a happy number.

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 21919199 - 2²⁰ = 20870623 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 (21919109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20129 + ... + 21189.

It is an arithmetic number, because the mean of its divisors is an integer number (2789874).

Almost surely, 2^21919199 is an apocalyptic number.

21919199 is a deficient number, since it is larger than the sum of its proper divisors (399793).

21919199 is a wasteful number, since it uses less digits than its factorization.

21919199 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1417.

The product of its digits is 13122, while the sum is 41.

The square root of 21919199 is about 4681.7944209459. The cubic root of 21919199 is about 279.8604704472.

The spelling of 21919199 in words is "twenty-one million, nine hundred nineteen thousand, one hundred ninety-nine".