21222886 has 8 divisors (see below), whose sum is σ = 33509880. Its totient is φ = 10052928.

The previous prime is 21222847. The next prime is 21222913. The reversal of 21222886 is 68822212.

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, 279211 + ... + 279286.

It is an arithmetic number, because the mean of its divisors is an integer number (4188735).

Almost surely, 2^21222886 is an apocalyptic number.

21222886 is a deficient number, since it is larger than the sum of its proper divisors (12286994).

21222886 is a wasteful number, since it uses less digits than its factorization.

21222886 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 558518.

The product of its digits is 6144, while the sum is 31.

The square root of 21222886 is about 4606.8303637100. The cubic root of 21222886 is about 276.8650569766.

The spelling of 21222886 in words is "twenty-one million, two hundred twenty-two thousand, eight hundred eighty-six".