21242199 has 8 divisors (see below), whose sum is σ = 30897792. Its totient is φ = 12874040.

The previous prime is 21242191. The next prime is 21242201. The reversal of 21242199 is 99124212.

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 21242199 - 2³ = 21242191 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21242191) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 321819 + ... + 321884.

It is an arithmetic number, because the mean of its divisors is an integer number (3862224).

Almost surely, 2^21242199 is an apocalyptic number.

21242199 is a deficient number, since it is larger than the sum of its proper divisors (9655593).

21242199 is a wasteful number, since it uses less digits than its factorization.

21242199 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 643717.

The product of its digits is 2592, while the sum is 30.

The square root of 21242199 is about 4608.9260137260. The cubic root of 21242199 is about 276.9490146704.

The spelling of 21242199 in words is "twenty-one million, two hundred forty-two thousand, one hundred ninety-nine".