22287321 has 12 divisors (see below), whose sum is σ = 36791872. Its totient is φ = 12735576.

The previous prime is 22287301. The next prime is 22287337. The reversal of 22287321 is 12378222.

It is a happy number.

It is not a de Polignac number, because 22287321 - 2⁶ = 22287257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22287301) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 176821 + ... + 176946.

Almost surely, 2^22287321 is an apocalyptic number.

22287321 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

22287321 is a deficient number, since it is larger than the sum of its proper divisors (14504551).

22287321 is a wasteful number, since it uses less digits than its factorization.

22287321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 353780 (or 353777 counting only the distinct ones).

The product of its digits is 2688, while the sum is 27.

The square root of 22287321 is about 4720.9449266010. The cubic root of 22287321 is about 281.4184863053.

Subtracting from 22287321 its reverse (12378222), we obtain a palindrome (9909099).

The spelling of 22287321 in words is "twenty-two million, two hundred eighty-seven thousand, three hundred twenty-one".