21222368 has 24 divisors (see below), whose sum is σ = 42071400. Its totient is φ = 10537600.

The previous prime is 21222367. The next prime is 21222371. The reversal of 21222368 is 86322212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21222361) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2543 + ... + 6993.

It is an arithmetic number, because the mean of its divisors is an integer number (1752975).

Almost surely, 2^21222368 is an apocalyptic number.

It is an amenable number.

21222368 is a deficient number, since it is larger than the sum of its proper divisors (20849032).

21222368 is a wasteful number, since it uses less digits than its factorization.

21222368 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4610 (or 4602 counting only the distinct ones).

The product of its digits is 2304, while the sum is 26.

The square root of 21222368 is about 4606.7741424993. The cubic root of 21222368 is about 276.8628044198.

The spelling of 21222368 in words is "twenty-one million, two hundred twenty-two thousand, three hundred sixty-eight".