12111220110021 has 16 divisors (see below), whose sum is σ = 16448609390400. Its totient is φ = 7924432385408.

The previous prime is 12111220109977. The next prime is 12111220110127. The reversal of 12111220110021 is 12001102211121.

It is a happy number.

It is not a de Polignac number, because 12111220110021 - 2¹⁸ = 12111219847877 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12111220150021) 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, 55340526 + ... + 55558943.

It is an arithmetic number, because the mean of its divisors is an integer number (1028038086900).

Almost surely, 2^{12111220110021} is an apocalyptic number.

It is an amenable number.

12111220110021 is a deficient number, since it is larger than the sum of its proper divisors (4337389280379).

12111220110021 is a wasteful number, since it uses less digits than its factorization.

12111220110021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110900148.

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

Adding to 12111220110021 its reverse (12001102211121), we get a palindrome (24112322321142).

The spelling of 12111220110021 in words is "twelve trillion, one hundred eleven billion, two hundred twenty million, one hundred ten thousand, twenty-one".