22281399 has 24 divisors (see below), whose sum is σ = 38147200. Its totient is φ = 12731256.

The previous prime is 22281379. The next prime is 22281401. The reversal of 22281399 is 99318222.

It is not a de Polignac number, because 22281399 - 2⁹ = 22280887 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22281379) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4849 + ... + 8250.

Almost surely, 2^22281399 is an apocalyptic number.

22281399 is a deficient number, since it is larger than the sum of its proper divisors (15865801).

22281399 is an equidigital number, since it uses as much as digits as its factorization.

22281399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13121 (or 13109 counting only the distinct ones).

The product of its digits is 15552, while the sum is 36.

The square root of 22281399 is about 4720.3176799872. The cubic root of 22281399 is about 281.3935587107.

The spelling of 22281399 in words is "twenty-two million, two hundred eighty-one thousand, three hundred ninety-nine".