21659222 has 8 divisors (see below), whose sum is σ = 34988016. Its totient is φ = 9996552.

The previous prime is 21659219. The next prime is 21659243. The reversal of 21659222 is 22295612.

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 polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 416498 + ... + 416549.

It is an arithmetic number, because the mean of its divisors is an integer number (4373502).

Almost surely, 2^21659222 is an apocalyptic number.

21659222 is a deficient number, since it is larger than the sum of its proper divisors (13328794).

21659222 is a wasteful number, since it uses less digits than its factorization.

21659222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 833062.

The product of its digits is 4320, while the sum is 29.

The square root of 21659222 is about 4653.9469270717. The cubic root of 21659222 is about 278.7496201406.

The spelling of 21659222 in words is "twenty-one million, six hundred fifty-nine thousand, two hundred twenty-two".