22216865 has 16 divisors (see below), whose sum is σ = 29522880. Its totient is φ = 15913920.

The previous prime is 22216861. The next prime is 22216891. The reversal of 22216865 is 56861222.

It is not a de Polignac number, because 22216865 - 2² = 22216861 is a prime.

It is not an unprimeable number, because it can be changed into a prime (22216861) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 671 + ... + 6699.

It is an arithmetic number, because the mean of its divisors is an integer number (1845180).

Almost surely, 2^22216865 is an apocalyptic number.

It is an amenable number.

22216865 is a deficient number, since it is larger than the sum of its proper divisors (7306015).

22216865 is a wasteful number, since it uses less digits than its factorization.

22216865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6112.

The product of its digits is 11520, while the sum is 32.

The square root of 22216865 is about 4713.4769544361. The cubic root of 22216865 is about 281.1216276704.

The spelling of 22216865 in words is "twenty-two million, two hundred sixteen thousand, eight hundred sixty-five".