12011112321021 has 48 divisors (see below), whose sum is σ = 19750056947712. Its totient is φ = 6962766228000.

The previous prime is 12011112320953. The next prime is 12011112321073. The reversal of 12011112321021 is 12012321111021.

It is a happy number.

It is not a de Polignac number, because 12011112321021 - 2²¹ = 12011110223869 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 12011112320985 and 12011112321003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12011112321721) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 129631116 + ... + 129723738.

It is an arithmetic number, because the mean of its divisors is an integer number (411459519744).

Almost surely, 2^{12011112321021} is an apocalyptic number.

12011112321021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12011112321021 is a deficient number, since it is larger than the sum of its proper divisors (7738944626691).

12011112321021 is a wasteful number, since it uses less digits than its factorization.

12011112321021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149614 (or 149611 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 18.

Adding to 12011112321021 its reverse (12012321111021), we get a palindrome (24023433432042).

The spelling of 12011112321021 in words is "twelve trillion, eleven billion, one hundred twelve million, three hundred twenty-one thousand, twenty-one".