22215187 has 2 divisors, whose sum is σ = 22215188. Its totient is φ = 22215186.

The previous prime is 22215169. The next prime is 22215197. The reversal of 22215187 is 78151222.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22215187 is a prime.

It is not a weakly prime, because it can be changed into another prime (22215157) 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 as a sum of consecutive naturals, namely, 11107593 + 11107594.

It is an arithmetic number, because the mean of its divisors is an integer number (11107594).

Almost surely, 2^22215187 is an apocalyptic number.

22215187 is a deficient number, since it is larger than the sum of its proper divisors (1).

22215187 is an equidigital number, since it uses as much as digits as its factorization.

22215187 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2240, while the sum is 28.

The square root of 22215187 is about 4713.2989508411. The cubic root of 22215187 is about 281.1145499547.

The spelling of 22215187 in words is "twenty-two million, two hundred fifteen thousand, one hundred eighty-seven".