12012112012221 has 6 divisors (see below), whose sum is σ = 17350828462110. Its totient is φ = 8008074674808.

The previous prime is 12012112012217. The next prime is 12012112012223. The reversal of 12012112012221 is 12221021121021.

12012112012221 is a `hidden beast` number, since 1 + 201 + 211 + 20 + 12 + 221 = 666.

It can be written as a sum of positive squares in only one way, i.e., 11135802591225 + 876309420996 = 3337035^2 + 936114^2 .

It is not a de Polignac number, because 12012112012221 - 2² = 12012112012217 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12012112012194 and 12012112012203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12012112012223) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 667339556226 + ... + 667339556243.

It is an arithmetic number, because the mean of its divisors is an integer number (2891804743685).

Almost surely, 2^{12012112012221} is an apocalyptic number.

It is an amenable number.

12012112012221 is a deficient number, since it is larger than the sum of its proper divisors (5338716449889).

12012112012221 is a wasteful number, since it uses less digits than its factorization.

12012112012221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1334679112475 (or 1334679112472 counting only the distinct ones).

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

Adding to 12012112012221 its reverse (12221021121021), we get a palindrome (24233133133242).

The spelling of 12012112012221 in words is "twelve trillion, twelve billion, one hundred twelve million, twelve thousand, two hundred twenty-one".