12222221331 has 4 divisors (see below), whose sum is σ = 16296295112. Its totient is φ = 8148147552.

The previous prime is 12222221309. The next prime is 12222221353. The reversal of 12222221331 is 13312222221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13312222221 = 3 ⋅4437407407.

It is an interprime number because it is at equal distance from previous prime (12222221309) and next prime (12222221353).

It is not a de Polignac number, because 12222221331 - 2²² = 12218027027 is a prime.

It is a super-2 number, since 2×12222221331² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12222221298 and 12222221307.

It is not an unprimeable number, because it can be changed into a prime (12222221381) 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, 2037036886 + ... + 2037036891.

It is an arithmetic number, because the mean of its divisors is an integer number (4074073778).

Almost surely, 2^12222221331 is an apocalyptic number.

12222221331 is a deficient number, since it is larger than the sum of its proper divisors (4074073781).

12222221331 is an equidigital number, since it uses as much as digits as its factorization.

12222221331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4074073780.

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

Adding to 12222221331 its reverse (13312222221), we get a palindrome (25534443552).

The spelling of 12222221331 in words is "twelve billion, two hundred twenty-two million, two hundred twenty-one thousand, three hundred thirty-one".