21222695 has 8 divisors (see below), whose sum is σ = 27426336. Its totient is φ = 15672096.

The previous prime is 21222689. The next prime is 21222697. The reversal of 21222695 is 59622212.

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 21222695 - 2⁴ = 21222679 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21222697) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 163187 + ... + 163316.

It is an arithmetic number, because the mean of its divisors is an integer number (3428292).

Almost surely, 2^21222695 is an apocalyptic number.

21222695 is a deficient number, since it is larger than the sum of its proper divisors (6203641).

21222695 is a wasteful number, since it uses less digits than its factorization.

21222695 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 326521.

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

The square root of 21222695 is about 4606.8096335751. The cubic root of 21222695 is about 276.8642264049.

The spelling of 21222695 in words is "twenty-one million, two hundred twenty-two thousand, six hundred ninety-five".