22221643 has 4 divisors (see below), whose sum is σ = 22274848. Its totient is φ = 22168440.

The previous prime is 22221599. The next prime is 22221649. The reversal of 22221643 is 34612222.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34612222 = 2 ⋅17306111.

It is a cyclic number.

It is not a de Polignac number, because 22221643 - 2²¹ = 20124491 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22221649) 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, 25971 + ... + 26812.

It is an arithmetic number, because the mean of its divisors is an integer number (5568712).

Almost surely, 2^22221643 is an apocalyptic number.

22221643 is a deficient number, since it is larger than the sum of its proper divisors (53205).

22221643 is an equidigital number, since it uses as much as digits as its factorization.

22221643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53204.

The product of its digits is 1152, while the sum is 22.

The square root of 22221643 is about 4713.9837717158. The cubic root of 22221643 is about 281.1417790713.

Adding to 22221643 its reverse (34612222), we get a palindrome (56833865).

The spelling of 22221643 in words is "twenty-two million, two hundred twenty-one thousand, six hundred forty-three".