12100111210021 has 4 divisors (see below), whose sum is σ = 12100122233632. Its totient is φ = 12100100186412.

The previous prime is 12100111209959. The next prime is 12100111210051. The reversal of 12100111210021 is 12001211100121.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12100111210021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12100111209983 and 12100111210010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12100111210051) 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, 3657345 + ... + 6129958.

It is an arithmetic number, because the mean of its divisors is an integer number (3025030558408).

Almost surely, 2^{12100111210021} is an apocalyptic number.

It is an amenable number.

12100111210021 is a deficient number, since it is larger than the sum of its proper divisors (11023611).

12100111210021 is an equidigital number, since it uses as much as digits as its factorization.

12100111210021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11023610.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 12100111210021 its reverse (12001211100121), we get a palindrome (24101322310142).

The spelling of 12100111210021 in words is "twelve trillion, one hundred billion, one hundred eleven million, two hundred ten thousand, twenty-one".