12221120121 has 8 divisors (see below), whose sum is σ = 18622659264. Its totient is φ = 6983497200.

The previous prime is 12221120101. The next prime is 12221120129. The reversal of 12221120121 is 12102112221.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 12221120121 - 2⁹ = 12221119609 is a prime.

It is a super-2 number, since 2×12221120121² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 12221120121.

It is not an unprimeable number, because it can be changed into a prime (12221120129) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 290979030 + ... + 290979071.

It is an arithmetic number, because the mean of its divisors is an integer number (2327832408).

Almost surely, 2^12221120121 is an apocalyptic number.

It is an amenable number.

12221120121 is a deficient number, since it is larger than the sum of its proper divisors (6401539143).

12221120121 is an equidigital number, since it uses as much as digits as its factorization.

12221120121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 581958111.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 12221120121 its reverse (12102112221), we get a palindrome (24323232342).

The spelling of 12221120121 in words is "twelve billion, two hundred twenty-one million, one hundred twenty thousand, one hundred twenty-one".