12012221221021 has 32 divisors (see below), whose sum is σ = 14014178678016. Its totient is φ = 10083235968000.

The previous prime is 12012221220977. The next prime is 12012221221037. The reversal of 12012221221021 is 12012212221021.

12012221221021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 12012221221021 - 2³³ = 12003631286429 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12012221221021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12012221221921) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 650671731 + ... + 650690191.

It is an arithmetic number, because the mean of its divisors is an integer number (437943083688).

Almost surely, 2^{12012221221021} is an apocalyptic number.

It is an amenable number.

12012221221021 is a deficient number, since it is larger than the sum of its proper divisors (2001957456995).

12012221221021 is a wasteful number, since it uses less digits than its factorization.

12012221221021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25093.

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

Adding to 12012221221021 its reverse (12012212221021), we get a palindrome (24024433442042).

Subtracting from 12012221221021 its reverse (12012212221021), we obtain a square (9000000 = 3000²).

The spelling of 12012221221021 in words is "twelve trillion, twelve billion, two hundred twenty-one million, two hundred twenty-one thousand, twenty-one".