22722215 has 4 divisors (see below), whose sum is σ = 27266664. Its totient is φ = 18177768.

The previous prime is 22722211. The next prime is 22722223. The reversal of 22722215 is 51222722.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 51222722 = 2 ⋅25611361.

It is a cyclic number.

It is not a de Polignac number, because 22722215 - 2² = 22722211 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 (22722211) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2272217 + ... + 2272226.

It is an arithmetic number, because the mean of its divisors is an integer number (6816666).

Almost surely, 2^22722215 is an apocalyptic number.

22722215 is a deficient number, since it is larger than the sum of its proper divisors (4544449).

22722215 is an equidigital number, since it uses as much as digits as its factorization.

22722215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4544448.

The product of its digits is 1120, while the sum is 23.

The square root of 22722215 is about 4766.7824578011. The cubic root of 22722215 is about 283.2371538216.

Adding to 22722215 its reverse (51222722), we get a palindrome (73944937).

The spelling of 22722215 in words is "twenty-two million, seven hundred twenty-two thousand, two hundred fifteen".