21222267 has 8 divisors (see below), whose sum is σ = 30868800. Its totient is φ = 12861960.

The previous prime is 21222251. The next prime is 21222269. The reversal of 21222267 is 76222212.

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

It is not a de Polignac number, because 21222267 - 2⁴ = 21222251 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21222269) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 321517 + ... + 321582.

It is an arithmetic number, because the mean of its divisors is an integer number (3858600).

Almost surely, 2^21222267 is an apocalyptic number.

21222267 is a deficient number, since it is larger than the sum of its proper divisors (9646533).

21222267 is a wasteful number, since it uses less digits than its factorization.

21222267 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 643113.

The product of its digits is 1344, while the sum is 24.

The square root of 21222267 is about 4606.7631803686. The cubic root of 21222267 is about 276.8623652104.

Adding to 21222267 its reverse (76222212), we get a palindrome (97444479).

Subtracting 21222267 from its reverse (76222212), we obtain a palindrome (54999945).

The spelling of 21222267 in words is "twenty-one million, two hundred twenty-two thousand, two hundred sixty-seven".