221123233 has 4 divisors (see below), whose sum is σ = 234130500. Its totient is φ = 208115968.

The previous prime is 221123213. The next prime is 221123251. The reversal of 221123233 is 332321122.

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 132894784 + 88228449 = 11528^2 + 9393^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221123233 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 221123233.

It is not an unprimeable number, because it can be changed into a prime (221123213) 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, 6503608 + ... + 6503641.

It is an arithmetic number, because the mean of its divisors is an integer number (58532625).

Almost surely, 2^221123233 is an apocalyptic number.

It is an amenable number.

221123233 is a deficient number, since it is larger than the sum of its proper divisors (13007267).

221123233 is a wasteful number, since it uses less digits than its factorization.

221123233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13007266.

The product of its digits is 432, while the sum is 19.

The square root of 221123233 is about 14870.2129440032. The cubic root of 221123233 is about 604.7067157588.

Adding to 221123233 its reverse (332321122), we get a palindrome (553444355).

The spelling of 221123233 in words is "two hundred twenty-one million, one hundred twenty-three thousand, two hundred thirty-three".