12021011321 has 12 divisors (see below), whose sum is σ = 13990425876. Its totient is φ = 10285355520.

The previous prime is 12021011311. The next prime is 12021011377. The reversal of 12021011321 is 12311012021.

It can be written as a sum of positive squares in 2 ways, for example, as 5634604096 + 6386407225 = 75064^2 + 79915^2 .

It is a de Polignac number, because none of the positive numbers 2^k-12021011321 is a prime.

It is a super-2 number, since 2×12021011321² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 12021011296 and 12021011305.

It is not an unprimeable number, because it can be changed into a prime (12021011311) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2919920 + ... + 2924033.

It is an arithmetic number, because the mean of its divisors is an integer number (1165868823).

Almost surely, 2^12021011321 is an apocalyptic number.

12021011321 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12021011321 is a deficient number, since it is larger than the sum of its proper divisors (1969414555).

12021011321 is a wasteful number, since it uses less digits than its factorization.

12021011321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5843992 (or 5843981 counting only the distinct ones).

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

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

The spelling of 12021011321 in words is "twelve billion, twenty-one million, eleven thousand, three hundred twenty-one".