22216891 has 2 divisors, whose sum is σ = 22216892. Its totient is φ = 22216890.

The previous prime is 22216861. The next prime is 22216897. The reversal of 22216891 is 19861222.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22216891 is a prime.

It is not a weakly prime, because it can be changed into another prime (22216897) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11108445 + 11108446.

It is an arithmetic number, because the mean of its divisors is an integer number (11108446).

Almost surely, 2^22216891 is an apocalyptic number.

22216891 is a deficient number, since it is larger than the sum of its proper divisors (1).

22216891 is an equidigital number, since it uses as much as digits as its factorization.

22216891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3456, while the sum is 31.

The square root of 22216891 is about 4713.4797124842. The cubic root of 22216891 is about 281.1217373343.

The spelling of 22216891 in words is "twenty-two million, two hundred sixteen thousand, eight hundred ninety-one".