21809222 has 8 divisors (see below), whose sum is σ = 33410016. Its totient is φ = 10672552.

The previous prime is 21809219. The next prime is 21809231. The reversal of 21809222 is 22290812.

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

It is a junction number, because it is equal to n+sod(n) for n = 21809191 and 21809200.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 115913 + ... + 116100.

It is an arithmetic number, because the mean of its divisors is an integer number (4176252).

Almost surely, 2^21809222 is an apocalyptic number.

21809222 is a deficient number, since it is larger than the sum of its proper divisors (11600794).

21809222 is a wasteful number, since it uses less digits than its factorization.

21809222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 232062.

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 21809222 is about 4670.0344752475. The cubic root of 21809222 is about 279.3916298008.

The spelling of 21809222 in words is "twenty-one million, eight hundred nine thousand, two hundred twenty-two".