12222101221 has 12 divisors (see below), whose sum is σ = 13557474700. Its totient is φ = 11009053440.

The previous prime is 12222101219. The next prime is 12222101263. The reversal of 12222101221 is 12210122221.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 4576522500 + 7645578721 = 67650^2 + 87439^2 .

It is not a de Polignac number, because 12222101221 - 2¹ = 12222101219 is a prime.

It is a super-3 number, since 3×12222101221³ (a number of 31 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 12222101195 and 12222101204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12222101621) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 450156 + ... + 476533.

Almost surely, 2^12222101221 is an apocalyptic number.

12222101221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12222101221 is a deficient number, since it is larger than the sum of its proper divisors (1335373479).

12222101221 is a wasteful number, since it uses less digits than its factorization.

12222101221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 926820 (or 926809 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 12222101221 its reverse (12210122221), we get a palindrome (24432223442).

The spelling of 12222101221 in words is "twelve billion, two hundred twenty-two million, one hundred one thousand, two hundred twenty-one".