12100011121221 has 16 divisors (see below), whose sum is σ = 16300309605888. Its totient is φ = 7983199872000.

The previous prime is 12100011121201. The next prime is 12100011121249. The reversal of 12100011121221 is 12212111000121.

It is a happy number.

It is not a de Polignac number, because 12100011121221 - 2⁵ = 12100011121189 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12100011121221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12100011121201) 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, 6750601 + ... + 8352881.

It is an arithmetic number, because the mean of its divisors is an integer number (1018769350368).

Almost surely, 2^{12100011121221} is an apocalyptic number.

It is an amenable number.

12100011121221 is a deficient number, since it is larger than the sum of its proper divisors (4200298484667).

12100011121221 is a wasteful number, since it uses less digits than its factorization.

12100011121221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1628332.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 12100011121221 its reverse (12212111000121), we get a palindrome (24312122121342).

The spelling of 12100011121221 in words is "twelve trillion, one hundred billion, eleven million, one hundred twenty-one thousand, two hundred twenty-one".