22366721 has 4 divisors (see below), whose sum is σ = 24087252. Its totient is φ = 20646192.

The previous prime is 22366711. The next prime is 22366739. The reversal of 22366721 is 12766322.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 874225 + 21492496 = 935^2 + 4636^2 .

It is a cyclic number.

It is not a de Polignac number, because 22366721 - 2⁶ = 22366657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22366711) 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, 860246 + ... + 860271.

It is an arithmetic number, because the mean of its divisors is an integer number (6021813).

Almost surely, 2^22366721 is an apocalyptic number.

It is an amenable number.

22366721 is a deficient number, since it is larger than the sum of its proper divisors (1720531).

22366721 is a wasteful number, since it uses less digits than its factorization.

22366721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1720530.

The product of its digits is 6048, while the sum is 29.

The square root of 22366721 is about 4729.3467836478. The cubic root of 22366721 is about 281.7522806554.

The spelling of 22366721 in words is "twenty-two million, three hundred sixty-six thousand, seven hundred twenty-one".