221323132221 has 4 divisors (see below), whose sum is σ = 295097509632. Its totient is φ = 147548754812.

The previous prime is 221323132213. The next prime is 221323132231. The reversal of 221323132221 is 122231323122.

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 221323132221 - 2³ = 221323132213 is a prime.

It is a super-2 number, since 2×221323132221² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 221323132191 and 221323132200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221323132231) 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, 36887188701 + ... + 36887188706.

It is an arithmetic number, because the mean of its divisors is an integer number (73774377408).

Almost surely, 2^221323132221 is an apocalyptic number.

It is an amenable number.

221323132221 is a deficient number, since it is larger than the sum of its proper divisors (73774377411).

221323132221 is an equidigital number, since it uses as much as digits as its factorization.

221323132221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73774377410.

The product of its digits is 1728, while the sum is 24.

Adding to 221323132221 its reverse (122231323122), we get a palindrome (343554455343).

The spelling of 221323132221 in words is "two hundred twenty-one billion, three hundred twenty-three million, one hundred thirty-two thousand, two hundred twenty-one".