221223201321 has 4 divisors (see below), whose sum is σ = 294964268432. Its totient is φ = 147482134212.

The previous prime is 221223201253. The next prime is 221223201371. The reversal of 221223201321 is 123102322122.

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 221223201321 - 2⁷ = 221223201193 is a prime.

It is a super-2 number, since 2×221223201321² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221223201371) 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, 36870533551 + ... + 36870533556.

It is an arithmetic number, because the mean of its divisors is an integer number (73741067108).

Almost surely, 2^221223201321 is an apocalyptic number.

It is an amenable number.

221223201321 is a deficient number, since it is larger than the sum of its proper divisors (73741067111).

221223201321 is an equidigital number, since it uses as much as digits as its factorization.

221223201321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73741067110.

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

Adding to 221223201321 its reverse (123102322122), we get a palindrome (344325523443).

The spelling of 221223201321 in words is "two hundred twenty-one billion, two hundred twenty-three million, two hundred one thousand, three hundred twenty-one".