22721441 has 4 divisors (see below), whose sum is σ = 23335572. Its totient is φ = 22107312.

The previous prime is 22721437. The next prime is 22721467. The reversal of 22721441 is 14412722.

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 15241216 + 7480225 = 3904^2 + 2735^2 .

It is a cyclic number.

It is not a de Polignac number, because 22721441 - 2² = 22721437 is a prime.

It is a super-2 number, since 2×22721441² = 1032527762232962, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22721411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 307010 + ... + 307083.

It is an arithmetic number, because the mean of its divisors is an integer number (5833893).

Almost surely, 2^22721441 is an apocalyptic number.

It is an amenable number.

22721441 is a deficient number, since it is larger than the sum of its proper divisors (614131).

22721441 is an equidigital number, since it uses as much as digits as its factorization.

22721441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 614130.

The product of its digits is 896, while the sum is 23.

The square root of 22721441 is about 4766.7012702707. The cubic root of 22721441 is about 283.2339377612.

The spelling of 22721441 in words is "twenty-two million, seven hundred twenty-one thousand, four hundred forty-one".