221100243321 has 4 divisors (see below), whose sum is σ = 294800324432. Its totient is φ = 147400162212.

The previous prime is 221100243319. The next prime is 221100243341. The reversal of 221100243321 is 123342001122.

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 not a de Polignac number, because 221100243321 - 2¹ = 221100243319 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221100243341) 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, 36850040551 + ... + 36850040556.

It is an arithmetic number, because the mean of its divisors is an integer number (73700081108).

Almost surely, 2^221100243321 is an apocalyptic number.

It is an amenable number.

221100243321 is a deficient number, since it is larger than the sum of its proper divisors (73700081111).

221100243321 is an equidigital number, since it uses as much as digits as its factorization.

221100243321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73700081110.

The product of its (nonzero) digits is 576, while the sum is 21.

Adding to 221100243321 its reverse (123342001122), we get a palindrome (344442244443).

The spelling of 221100243321 in words is "two hundred twenty-one billion, one hundred million, two hundred forty-three thousand, three hundred twenty-one".