12001112122221 has 12 divisors (see below), whose sum is σ = 17335038424860. Its totient is φ = 8000695864320.

The previous prime is 12001112122213. The next prime is 12001112122231. The reversal of 12001112122221 is 12222121110021.

12001112122221 is a `hidden beast` number, since 120 + 0 + 111 + 212 + 2 + 221 = 666.

12001112122221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 8063407668996 + 3937704453225 = 2839614^2 + 1984365^2 .

It is not a de Polignac number, because 12001112122221 - 2³ = 12001112122213 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12001112122194 and 12001112122203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12001112122231) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2086740 + ... + 5325101.

It is an arithmetic number, because the mean of its divisors is an integer number (1444586535405).

Almost surely, 2^{12001112122221} is an apocalyptic number.

It is an amenable number.

12001112122221 is a deficient number, since it is larger than the sum of its proper divisors (5333926302639).

12001112122221 is a wasteful number, since it uses less digits than its factorization.

12001112122221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7591756 (or 7591753 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 12001112122221 its reverse (12222121110021), we get a palindrome (24223233232242).

The spelling of 12001112122221 in words is "twelve trillion, one billion, one hundred twelve million, one hundred twenty-two thousand, two hundred twenty-one".