12120111012221 has 4 divisors (see below), whose sum is σ = 12212630943744. Its totient is φ = 12027591080700.

The previous prime is 12120111012187. The next prime is 12120111012253. The reversal of 12120111012221 is 12221011102121.

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-12120111012221 is a prime.

It is a super-2 number, since 2×12120111012221² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12120111012221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12120161012221) 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, 46259965565 + ... + 46259965826.

It is an arithmetic number, because the mean of its divisors is an integer number (3053157735936).

Almost surely, 2^{12120111012221} is an apocalyptic number.

It is an amenable number.

12120111012221 is a deficient number, since it is larger than the sum of its proper divisors (92519931523).

12120111012221 is an equidigital number, since it uses as much as digits as its factorization.

12120111012221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92519931522.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 12120111012221 its reverse (12221011102121), we get a palindrome (24341122114342).

The spelling of 12120111012221 in words is "twelve trillion, one hundred twenty billion, one hundred eleven million, twelve thousand, two hundred twenty-one".