21799222 has 8 divisors (see below), whose sum is σ = 32821200. Its totient is φ = 10858824.

The previous prime is 21799199. The next prime is 21799241. The reversal of 21799222 is 22299712.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19722 + ... + 20797.

It is an arithmetic number, because the mean of its divisors is an integer number (4102650).

Almost surely, 2^21799222 is an apocalyptic number.

21799222 is a deficient number, since it is larger than the sum of its proper divisors (11021978).

21799222 is a wasteful number, since it uses less digits than its factorization.

21799222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40790.

The product of its digits is 9072, while the sum is 34.

The square root of 21799222 is about 4668.9636965819. The cubic root of 21799222 is about 279.3489209041.

The spelling of 21799222 in words is "twenty-one million, seven hundred ninety-nine thousand, two hundred twenty-two".