12102112100021 has 4 divisors (see below), whose sum is σ = 12104879566572. Its totient is φ = 12099344633472.

The previous prime is 12102112099997. The next prime is 12102112100027. The reversal of 12102112100021 is 12000121120121.

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 3294809455921 + 8807302644100 = 1815161^2 + 2967710^2 .

It is a cyclic number.

It is not a de Polignac number, because 12102112100021 - 2²² = 12102107905717 is a prime.

It is a super-2 number, since 2×12102112100021² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12102112099969 and 12102112100005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12102112100027) 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, 1383726716 + ... + 1383735461.

It is an arithmetic number, because the mean of its divisors is an integer number (3026219891643).

Almost surely, 2^{12102112100021} is an apocalyptic number.

It is an amenable number.

12102112100021 is a deficient number, since it is larger than the sum of its proper divisors (2767466551).

12102112100021 is an equidigital number, since it uses as much as digits as its factorization.

12102112100021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2767466550.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 12102112100021 its reverse (12000121120121), we get a palindrome (24102233220142).

The spelling of 12102112100021 in words is "twelve trillion, one hundred two billion, one hundred twelve million, one hundred thousand, twenty-one".