221313222221 has 8 divisors (see below), whose sum is σ = 272385504384. Its totient is φ = 175104966960.

The previous prime is 221313222181. The next prime is 221313222269. The reversal of 221313222221 is 122222313122.

It is a happy number.

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

It is not a de Polignac number, because 221313222221 - 2³⁰ = 220239480397 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221313222281) 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, 1216006625 + ... + 1216006806.

It is an arithmetic number, because the mean of its divisors is an integer number (34048188048).

Almost surely, 2^221313222221 is an apocalyptic number.

It is an amenable number.

221313222221 is a deficient number, since it is larger than the sum of its proper divisors (51072282163).

221313222221 is a wasteful number, since it uses less digits than its factorization.

221313222221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2432013451.

The product of its digits is 1152, while the sum is 23.

Adding to 221313222221 its reverse (122222313122), we get a palindrome (343535535343).

Subtracting from 221313222221 its reverse (122222313122), we obtain a palindrome (99090909099).

The spelling of 221313222221 in words is "two hundred twenty-one billion, three hundred thirteen million, two hundred twenty-two thousand, two hundred twenty-one".