12331100021 has 4 divisors (see below), whose sum is σ = 12332136492. Its totient is φ = 12330063552.

The previous prime is 12331099993. The next prime is 12331100029. The reversal of 12331100021 is 12000113321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12000113321 = 7 ⋅1714301903.

It can be written as a sum of positive squares in 2 ways, for example, as 6514749796 + 5816350225 = 80714^2 + 76265^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12331100021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12331099969 and 12331100005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12331100029) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 500180 + ... + 524253.

It is an arithmetic number, because the mean of its divisors is an integer number (3083034123).

Almost surely, 2^12331100021 is an apocalyptic number.

It is an amenable number.

12331100021 is a deficient number, since it is larger than the sum of its proper divisors (1036471).

12331100021 is a wasteful number, since it uses less digits than its factorization.

12331100021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1036470.

The product of its (nonzero) digits is 36, while the sum is 14.

Adding to 12331100021 its reverse (12000113321), we get a palindrome (24331213342).

The spelling of 12331100021 in words is "twelve billion, three hundred thirty-one million, one hundred thousand, twenty-one".