22221215 has 8 divisors (see below), whose sum is σ = 26710560. Its totient is φ = 17746912.

The previous prime is 22221211. The next prime is 22221233. The reversal of 22221215 is 51212222.

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 22221215 - 2² = 22221211 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 22221193 and 22221202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22221211) 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, 200 + ... + 6669.

It is an arithmetic number, because the mean of its divisors is an integer number (3338820).

Almost surely, 2^22221215 is an apocalyptic number.

22221215 is a deficient number, since it is larger than the sum of its proper divisors (4489345).

22221215 is an equidigital number, since it uses as much as digits as its factorization.

22221215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7521.

The product of its digits is 160, while the sum is 17.

The square root of 22221215 is about 4713.9383746502. The cubic root of 22221215 is about 281.1399740825.

Adding to 22221215 its reverse (51212222), we get a palindrome (73433437).

The spelling of 22221215 in words is "twenty-two million, two hundred twenty-one thousand, two hundred fifteen".