12311111221021 has 16 divisors (see below), whose sum is σ = 13206690131200. Its totient is φ = 11442175587648.

The previous prime is 12311111221001. The next prime is 12311111221039. The reversal of 12311111221021 is 12012211111321.

It is a cyclic number.

It is not a de Polignac number, because 12311111221021 - 2¹⁹ = 12311110696733 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a self number, because there is not a number n which added to its sum of digits gives 12311111221021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12311111221001) 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, 25885170 + ... + 26356483.

It is an arithmetic number, because the mean of its divisors is an integer number (825418133200).

Almost surely, 2^{12311111221021} is an apocalyptic number.

It is an amenable number.

12311111221021 is a deficient number, since it is larger than the sum of its proper divisors (895578910179).

12311111221021 is a wasteful number, since it uses less digits than its factorization.

12311111221021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52241908.

The product of its (nonzero) digits is 48, while the sum is 19.

Adding to 12311111221021 its reverse (12012211111321), we get a palindrome (24323322332342).

The spelling of 12311111221021 in words is "twelve trillion, three hundred eleven billion, one hundred eleven million, two hundred twenty-one thousand, twenty-one".