12120242221 has 4 divisors (see below), whose sum is σ = 12139823200. Its totient is φ = 12100661244.

The previous prime is 12120242159. The next prime is 12120242279. The reversal of 12120242221 is 12224202121.

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 not a de Polignac number, because 12120242221 - 2⁷ = 12120242093 is a prime.

It is a super-2 number, since 2×12120242221² (a number of 21 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 (12120242621) 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, 9789561 + ... + 9790798.

It is an arithmetic number, because the mean of its divisors is an integer number (3034955800).

Almost surely, 2^12120242221 is an apocalyptic number.

It is an amenable number.

12120242221 is a deficient number, since it is larger than the sum of its proper divisors (19580979).

12120242221 is an equidigital number, since it uses as much as digits as its factorization.

12120242221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19580978.

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

Adding to 12120242221 its reverse (12224202121), we get a palindrome (24344444342).

The spelling of 12120242221 in words is "twelve billion, one hundred twenty million, two hundred forty-two thousand, two hundred twenty-one".