221321233 has 8 divisors (see below), whose sum is σ = 254211200. Its totient is φ = 188749440.

The previous prime is 221321209. The next prime is 221321251. The reversal of 221321233 is 332123122.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 221321233 - 2¹³ = 221313041 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 221321233.

It is not an unprimeable number, because it can be changed into a prime (221321273) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 78048 + ... + 80833.

It is an arithmetic number, because the mean of its divisors is an integer number (31776400).

Almost surely, 2^221321233 is an apocalyptic number.

It is an amenable number.

221321233 is a deficient number, since it is larger than the sum of its proper divisors (32889967).

221321233 is a wasteful number, since it uses less digits than its factorization.

221321233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159087.

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

The square root of 221321233 is about 14876.8690590460. The cubic root of 221321233 is about 604.8871524151.

Adding to 221321233 its reverse (332123122), we get a palindrome (553444355).

The spelling of 221321233 in words is "two hundred twenty-one million, three hundred twenty-one thousand, two hundred thirty-three".