22382721 has 6 divisors (see below), whose sum is σ = 32330610. Its totient is φ = 14921808.

The previous prime is 22382719. The next prime is 22382777. The reversal of 22382721 is 12728322.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 15492096 + 6890625 = 3936^2 + 2625^2 .

It is not a de Polignac number, because 22382721 - 2¹ = 22382719 is a prime.

It is not an unprimeable number, because it can be changed into a prime (22382021) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1243476 + ... + 1243493.

It is an arithmetic number, because the mean of its divisors is an integer number (5388435).

Almost surely, 2^22382721 is an apocalyptic number.

It is an amenable number.

22382721 is a deficient number, since it is larger than the sum of its proper divisors (9947889).

22382721 is a wasteful number, since it uses less digits than its factorization.

22382721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2486975 (or 2486972 counting only the distinct ones).

The product of its digits is 2688, while the sum is 27.

The square root of 22382721 is about 4731.0380467716. The cubic root of 22382721 is about 281.8194483310.

It can be divided in two parts, 223 and 82721, that added together give a square (82944 = 288²).

The spelling of 22382721 in words is "twenty-two million, three hundred eighty-two thousand, seven hundred twenty-one".