222123643 has 4 divisors (see below), whose sum is σ = 253855600. Its totient is φ = 190391688.

The previous prime is 222123637. The next prime is 222123647. The reversal of 222123643 is 346321222.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 222123643 - 2⁵ = 222123611 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (222123647) 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, 15865968 + ... + 15865981.

It is an arithmetic number, because the mean of its divisors is an integer number (63463900).

Almost surely, 2^222123643 is an apocalyptic number.

222123643 is a deficient number, since it is larger than the sum of its proper divisors (31731957).

222123643 is an equidigital number, since it uses as much as digits as its factorization.

222123643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31731956.

The product of its digits is 3456, while the sum is 25.

The square root of 222123643 is about 14903.8130355960. The cubic root of 222123643 is about 605.6172858629.

Adding to 222123643 its reverse (346321222), we get a palindrome (568444865).

The spelling of 222123643 in words is "two hundred twenty-two million, one hundred twenty-three thousand, six hundred forty-three".