12221020121 has 4 divisors (see below), whose sum is σ = 12221251044. Its totient is φ = 12220789200.

The previous prime is 12221020093. The next prime is 12221020127. The reversal of 12221020121 is 12102012221.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4417064521 + 7803955600 = 66461^2 + 88340^2 .

It is a cyclic number.

It is not a de Polignac number, because 12221020121 - 2¹⁸ = 12220757977 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12221020096 and 12221020105.

It is not an unprimeable number, because it can be changed into a prime (12221020127) 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, 7751 + ... + 156531.

It is an arithmetic number, because the mean of its divisors is an integer number (3055312761).

Almost surely, 2^12221020121 is an apocalyptic number.

It is an amenable number.

12221020121 is a deficient number, since it is larger than the sum of its proper divisors (230923).

12221020121 is an equidigital number, since it uses as much as digits as its factorization.

12221020121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 230922.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 12221020121 its reverse (12102012221), we get a palindrome (24323032342).

The spelling of 12221020121 in words is "twelve billion, two hundred twenty-one million, twenty thousand, one hundred twenty-one".