22021841 has 4 divisors (see below), whose sum is σ = 22067184. Its totient is φ = 21976500.

The previous prime is 22021829. The next prime is 22021847. The reversal of 22021841 is 14812022.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 14812022 = 2 ⋅7406011.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22021841 is a prime.

It is a super-2 number, since 2×22021841² = 969922962058562, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (22021847) 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, 21935 + ... + 22916.

It is an arithmetic number, because the mean of its divisors is an integer number (5516796).

Almost surely, 2^22021841 is an apocalyptic number.

It is an amenable number.

22021841 is a deficient number, since it is larger than the sum of its proper divisors (45343).

22021841 is an equidigital number, since it uses as much as digits as its factorization.

22021841 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45342.

The product of its (nonzero) digits is 256, while the sum is 20.

The square root of 22021841 is about 4692.7434406752. The cubic root of 22021841 is about 280.2966286714.

Adding to 22021841 its reverse (14812022), we get a palindrome (36833863).

The spelling of 22021841 in words is "twenty-two million, twenty-one thousand, eight hundred forty-one".