22221668 has 24 divisors (see below), whose sum is σ = 45878784. Its totient is φ = 9216000.

The previous prime is 22221649. The next prime is 22221691. The reversal of 22221668 is 86612222.

It is a Smith number, since the sum of its digits (29) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 22221668.

It is an unprimeable number.

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 in 7 ways as a sum of consecutive naturals, for example, 11933 + ... + 13668.

It is an arithmetic number, because the mean of its divisors is an integer number (1911616).

Almost surely, 2^22221668 is an apocalyptic number.

22221668 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

22221668 is an abundant number, since it is smaller than the sum of its proper divisors (23657116).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

22221668 is a wasteful number, since it uses less digits than its factorization.

22221668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25643 (or 25641 counting only the distinct ones).

The product of its digits is 4608, while the sum is 29.

The square root of 22221668 is about 4713.9864234001. The cubic root of 22221668 is about 281.1418845022.

The spelling of 22221668 in words is "twenty-two million, two hundred twenty-one thousand, six hundred sixty-eight".