21998219 has 8 divisors (see below), whose sum is σ = 23418000. Its totient is φ = 20604672.

The previous prime is 21998203. The next prime is 21998231. The reversal of 21998219 is 91289912.

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 21998219 - 2⁴ = 21998203 is a prime.

It is a super-2 number, since 2×21998219² = 967843278343922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21998299) 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, 4814 + ... + 8195.

It is an arithmetic number, because the mean of its divisors is an integer number (2927250).

Almost surely, 2^21998219 is an apocalyptic number.

21998219 is a deficient number, since it is larger than the sum of its proper divisors (1419781).

21998219 is a wasteful number, since it uses less digits than its factorization.

21998219 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13117.

The product of its digits is 23328, while the sum is 41.

The square root of 21998219 is about 4690.2259007429. The cubic root of 21998219 is about 280.1963716008.

The spelling of 21998219 in words is "twenty-one million, nine hundred ninety-eight thousand, two hundred nineteen".