22218716 has 12 divisors (see below), whose sum is σ = 41873832. Its totient is φ = 10254768.

The previous prime is 22218697. The next prime is 22218719. The reversal of 22218716 is 61781222.

It is a super-4 number, since 4×22218716⁴ (a number of 30 digits) contains 4444 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22218719) 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 in 3 ways as a sum of consecutive naturals, for example, 213590 + ... + 213693.

It is an arithmetic number, because the mean of its divisors is an integer number (3489486).

Almost surely, 2^22218716 is an apocalyptic number.

22218716 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

22218716 is a deficient number, since it is larger than the sum of its proper divisors (19655116).

22218716 is a wasteful number, since it uses less digits than its factorization.

22218716 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 427300 (or 427298 counting only the distinct ones).

The product of its digits is 2688, while the sum is 29.

The square root of 22218716 is about 4713.6733022135. The cubic root of 22218716 is about 281.1294346778.

Adding to 22218716 its reverse (61781222), we get a palindrome (83999938).

The spelling of 22218716 in words is "twenty-two million, two hundred eighteen thousand, seven hundred sixteen".