12311012021 has 48 divisors (see below), whose sum is σ = 15694783104. Its totient is φ = 9451728000.

The previous prime is 12311011967. The next prime is 12311012029. The reversal of 12311012021 is 12021011321.

It is not a de Polignac number, because 12311012021 - 2¹⁸ = 12310749877 is a prime.

It is a super-2 number, since 2×12311012021² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 12311011987 and 12311012005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12311012029) 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 47 ways as a sum of consecutive naturals, for example, 20082911 + ... + 20083523.

It is an arithmetic number, because the mean of its divisors is an integer number (326974648).

Almost surely, 2^12311012021 is an apocalyptic number.

12311012021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12311012021 is a deficient number, since it is larger than the sum of its proper divisors (3383771083).

12311012021 is a wasteful number, since it uses less digits than its factorization.

12311012021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 954 (or 943 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 14.

Adding to 12311012021 its reverse (12021011321), we get a palindrome (24332023342).

The spelling of 12311012021 in words is "twelve billion, three hundred eleven million, twelve thousand, twenty-one".