22282721 has 8 divisors (see below), whose sum is σ = 23056488. Its totient is φ = 21520000.

The previous prime is 22282709. The next prime is 22282727. The reversal of 22282721 is 12728222.

It can be written as a sum of positive squares in 4 ways, for example, as 2131600 + 20151121 = 1460^2 + 4489^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22282721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22282727) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1451 + ... + 6831.

It is an arithmetic number, because the mean of its divisors is an integer number (2882061).

Almost surely, 2^22282721 is an apocalyptic number.

It is an amenable number.

22282721 is a deficient number, since it is larger than the sum of its proper divisors (773767).

22282721 is a wasteful number, since it uses less digits than its factorization.

22282721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5523.

The product of its digits is 1792, while the sum is 26.

The square root of 22282721 is about 4720.4577108581. The cubic root of 22282721 is about 281.3991238150.

The spelling of 22282721 in words is "twenty-two million, two hundred eighty-two thousand, seven hundred twenty-one".