12311021443 has 16 divisors (see below), whose sum is σ = 14836011520. Its totient is φ = 9979531776.

The previous prime is 12311021441. The next prime is 12311021483. The reversal of 12311021443 is 34412011321.

It is a cyclic number.

It is not a de Polignac number, because 12311021443 - 2¹ = 12311021441 is a prime.

It is a super-2 number, since 2×12311021443² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12311021441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3471 + ... + 156952.

It is an arithmetic number, because the mean of its divisors is an integer number (927250720).

Almost surely, 2^12311021443 is an apocalyptic number.

12311021443 is a deficient number, since it is larger than the sum of its proper divisors (2524990077).

12311021443 is a wasteful number, since it uses less digits than its factorization.

12311021443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161026.

The product of its (nonzero) digits is 576, while the sum is 22.

Adding to 12311021443 its reverse (34412011321), we get a palindrome (46723032764).

The spelling of 12311021443 in words is "twelve billion, three hundred eleven million, twenty-one thousand, four hundred forty-three".