222303231221 has 4 divisors (see below), whose sum is σ = 222306595500. Its totient is φ = 222299866944.

The previous prime is 222303231211. The next prime is 222303231229. The reversal of 222303231221 is 122132303222.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 122132303222 = 2 ⋅61066151611.

It can be written as a sum of positive squares in 2 ways, for example, as 54109738225 + 168193492996 = 232615^2 + 410114^2 .

It is a cyclic number.

It is not a de Polignac number, because 222303231221 - 2¹⁰ = 222303230197 is a prime.

It is a super-2 number, since 2×222303231221² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (222303231229) 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, 1580996 + ... + 1715853.

It is an arithmetic number, because the mean of its divisors is an integer number (55576648875).

Almost surely, 2^222303231221 is an apocalyptic number.

It is an amenable number.

222303231221 is a deficient number, since it is larger than the sum of its proper divisors (3364279).

222303231221 is an equidigital number, since it uses as much as digits as its factorization.

222303231221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3364278.

The product of its (nonzero) digits is 1728, while the sum is 23.

Adding to 222303231221 its reverse (122132303222), we get a palindrome (344435534443).

The spelling of 222303231221 in words is "two hundred twenty-two billion, three hundred three million, two hundred thirty-one thousand, two hundred twenty-one".