12120101222221 has 16 divisors (see below), whose sum is σ = 12230118194544. Its totient is φ = 12010405330944.

The previous prime is 12120101222191. The next prime is 12120101222237. The reversal of 12120101222221 is 12222210102121.

It can be written as a sum of positive squares in 8 ways, for example, as 457801092100 + 11662300130121 = 676610^2 + 3415011^2 .

It is a cyclic number.

It is not a de Polignac number, because 12120101222221 - 2²⁵ = 12120067667789 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12120101222521) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 457400845 + ... + 457427341.

It is an arithmetic number, because the mean of its divisors is an integer number (764382387159).

Almost surely, 2^{12120101222221} is an apocalyptic number.

It is an amenable number.

12120101222221 is a deficient number, since it is larger than the sum of its proper divisors (110016972323).

12120101222221 is a wasteful number, since it uses less digits than its factorization.

12120101222221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32400.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 12120101222221 its reverse (12222210102121), we get a palindrome (24342311324342).

The spelling of 12120101222221 in words is "twelve trillion, one hundred twenty billion, one hundred one million, two hundred twenty-two thousand, two hundred twenty-one".