12102311021 has 4 divisors (see below), whose sum is σ = 12227077212. Its totient is φ = 11977544832.

The previous prime is 12102310991. The next prime is 12102311027. The reversal of 12102311021 is 12011320121.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3996009796 + 8106301225 = 63214^2 + 90035^2 .

It is a cyclic number.

It is not a de Polignac number, because 12102311021 - 2¹⁸ = 12102048877 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12102310987 and 12102311005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12102311027) 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, 62382950 + ... + 62383143.

It is an arithmetic number, because the mean of its divisors is an integer number (3056769303).

Almost surely, 2^12102311021 is an apocalyptic number.

It is an amenable number.

12102311021 is a deficient number, since it is larger than the sum of its proper divisors (124766191).

12102311021 is an equidigital number, since it uses as much as digits as its factorization.

12102311021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124766190.

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

Adding to 12102311021 its reverse (12011320121), we get a palindrome (24113631142).

The spelling of 12102311021 in words is "twelve billion, one hundred two million, three hundred eleven thousand, twenty-one".