12222420121 has 4 divisors (see below), whose sum is σ = 12223018192. Its totient is φ = 12221822052.

The previous prime is 12222420109. The next prime is 12222420163. The reversal of 12222420121 is 12102422221.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12222420121 is a prime.

It is a super-2 number, since 2×12222420121² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12222420191) 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, 267255 + ... + 309628.

It is an arithmetic number, because the mean of its divisors is an integer number (3055754548).

Almost surely, 2^12222420121 is an apocalyptic number.

It is an amenable number.

12222420121 is a deficient number, since it is larger than the sum of its proper divisors (598071).

12222420121 is an equidigital number, since it uses as much as digits as its factorization.

12222420121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 598070.

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 12222420121 its reverse (12102422221), we get a palindrome (24324842342).

The spelling of 12222420121 in words is "twelve billion, two hundred twenty-two million, four hundred twenty thousand, one hundred twenty-one".