22215427 has 16 divisors (see below), whose sum is σ = 25673760. Its totient is φ = 19049472.

The previous prime is 22215409. The next prime is 22215491. The reversal of 22215427 is 72451222.

It is not a de Polignac number, because 22215427 - 2⁷ = 22215299 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22215497) 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 15 ways as a sum of consecutive naturals, for example, 12243 + ... + 13939.

It is an arithmetic number, because the mean of its divisors is an integer number (1604610).

Almost surely, 2^22215427 is an apocalyptic number.

22215427 is a deficient number, since it is larger than the sum of its proper divisors (3458333).

22215427 is a wasteful number, since it uses less digits than its factorization.

22215427 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1782.

The product of its digits is 2240, while the sum is 25.

The square root of 22215427 is about 4713.3244106469. The cubic root of 22215427 is about 281.1155622839.

Adding to 22215427 its reverse (72451222), we get a palindrome (94666649).

The spelling of 22215427 in words is "twenty-two million, two hundred fifteen thousand, four hundred twenty-seven".