12022222221 has 6 divisors (see below), whose sum is σ = 17365432110. Its totient is φ = 8014814808.

The previous prime is 12022222217. The next prime is 12022222243. The reversal of 12022222221 is 12222222021.

It can be written as a sum of positive squares in only one way, i.e., 10380756996 + 1641465225 = 101886^2 + 40515^2 .

It is not a de Polignac number, because 12022222221 - 2² = 12022222217 is a prime.

It is a super-2 number, since 2×12022222221² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 12022222194 and 12022222203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12022222021) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 667901226 + ... + 667901243.

It is an arithmetic number, because the mean of its divisors is an integer number (2894238685).

Almost surely, 2^12022222221 is an apocalyptic number.

It is an amenable number.

12022222221 is a deficient number, since it is larger than the sum of its proper divisors (5343209889).

12022222221 is a wasteful number, since it uses less digits than its factorization.

12022222221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1335802475 (or 1335802472 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

Adding to 12022222221 its reverse (12222222021), we get a palindrome (24244444242).

The spelling of 12022222221 in words is "twelve billion, twenty-two million, two hundred twenty-two thousand, two hundred twenty-one".