22216861 has 2 divisors, whose sum is σ = 22216862. Its totient is φ = 22216860.

The previous prime is 22216849. The next prime is 22216891. The reversal of 22216861 is 16861222.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22184100 + 32761 = 4710^2 + 181^2 .

It is a cyclic number.

It is not a de Polignac number, because 22216861 - 2⁵ = 22216829 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22216891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11108430 + 11108431.

It is an arithmetic number, because the mean of its divisors is an integer number (11108431).

Almost surely, 2^22216861 is an apocalyptic number.

It is an amenable number.

22216861 is a deficient number, since it is larger than the sum of its proper divisors (1).

22216861 is an equidigital number, since it uses as much as digits as its factorization.

22216861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2304, while the sum is 28.

The square root of 22216861 is about 4713.4765301208. The cubic root of 22216861 is about 281.1216107991.

The spelling of 22216861 in words is "twenty-two million, two hundred sixteen thousand, eight hundred sixty-one".