222221623 has 4 divisors (see below), whose sum is σ = 239315608. Its totient is φ = 205127640.

The previous prime is 222221617. The next prime is 222221639. The reversal of 222221623 is 326122222.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-222221623 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 222221594 and 222221603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (222221683) 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, 8546973 + ... + 8546998.

It is an arithmetic number, because the mean of its divisors is an integer number (59828902).

Almost surely, 2^222221623 is an apocalyptic number.

222221623 is a deficient number, since it is larger than the sum of its proper divisors (17093985).

222221623 is a wasteful number, since it uses less digits than its factorization.

222221623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17093984.

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

The square root of 222221623 is about 14907.0997514607. The cubic root of 222221623 is about 605.7063198474.

Adding to 222221623 its reverse (326122222), we get a palindrome (548343845).

The spelling of 222221623 in words is "two hundred twenty-two million, two hundred twenty-one thousand, six hundred twenty-three".