22128287 has 2 divisors, whose sum is σ = 22128288. Its totient is φ = 22128286.

The previous prime is 22128283. The next prime is 22128289. The reversal of 22128287 is 78282122.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 22128287 - 2² = 22128283 is a prime.

It is a super-2 number, since 2×22128287² = 979322171108738, which contains 22 as substring.

Together with 22128289, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22128283) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11064143 + 11064144.

It is an arithmetic number, because the mean of its divisors is an integer number (11064144).

Almost surely, 2^22128287 is an apocalyptic number.

22128287 is a deficient number, since it is larger than the sum of its proper divisors (1).

22128287 is an equidigital number, since it uses as much as digits as its factorization.

22128287 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7168, while the sum is 32.

The square root of 22128287 is about 4704.0713217382. The cubic root of 22128287 is about 280.7475221058.

The spelling of 22128287 in words is "twenty-two million, one hundred twenty-eight thousand, two hundred eighty-seven".