221323213321 has 4 divisors (see below), whose sum is σ = 252940815232. Its totient is φ = 189705611412.

The previous prime is 221323213303. The next prime is 221323213327. The reversal of 221323213321 is 123312323122.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 221323213321 - 2¹⁵ = 221323180553 is a prime.

It is not an unprimeable number, because it can be changed into a prime (221323213327) 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, 15808800945 + ... + 15808800958.

It is an arithmetic number, because the mean of its divisors is an integer number (63235203808).

Almost surely, 2^221323213321 is an apocalyptic number.

It is an amenable number.

221323213321 is a deficient number, since it is larger than the sum of its proper divisors (31617601911).

221323213321 is an equidigital number, since it uses as much as digits as its factorization.

221323213321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31617601910.

The product of its digits is 2592, while the sum is 25.

Adding to 221323213321 its reverse (123312323122), we get a palindrome (344635536443).

The spelling of 221323213321 in words is "two hundred twenty-one billion, three hundred twenty-three million, two hundred thirteen thousand, three hundred twenty-one".