12011100211221 has 32 divisors (see below), whose sum is σ = 16805875914240. Its totient is φ = 7621453472256.

The previous prime is 12011100211219. The next prime is 12011100211223. The reversal of 12011100211221 is 12211200111021.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (12011100211219) and next prime (12011100211223).

It is not a de Polignac number, because 12011100211221 - 2¹ = 12011100211219 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12011100211221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12011100211223) 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, 10017945 + ... + 11152641.

It is an arithmetic number, because the mean of its divisors is an integer number (525183622320).

Almost surely, 2^{12011100211221} is an apocalyptic number.

It is an amenable number.

12011100211221 is a deficient number, since it is larger than the sum of its proper divisors (4794775703019).

12011100211221 is a wasteful number, since it uses less digits than its factorization.

12011100211221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1136813.

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

Adding to 12011100211221 its reverse (12211200111021), we get a palindrome (24222300322242).

The spelling of 12011100211221 in words is "twelve trillion, eleven billion, one hundred million, two hundred eleven thousand, two hundred twenty-one".