12111012210021 has 4 divisors (see below), whose sum is σ = 16148016280032. Its totient is φ = 8074008140012.

The previous prime is 12111012209999. The next prime is 12111012210043. The reversal of 12111012210021 is 12001221011121.

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.

It is an interprime number because it is at equal distance from previous prime (12111012209999) and next prime (12111012210043).

It is a cyclic number.

It is not a de Polignac number, because 12111012210021 - 2⁹ = 12111012209509 is a prime.

It is a super-2 number, since 2×12111012210021² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12111012210071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2018502035001 + ... + 2018502035006.

It is an arithmetic number, because the mean of its divisors is an integer number (4037004070008).

Almost surely, 2^{12111012210021} is an apocalyptic number.

It is an amenable number.

12111012210021 is a deficient number, since it is larger than the sum of its proper divisors (4037004070011).

12111012210021 is an equidigital number, since it uses as much as digits as its factorization.

12111012210021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4037004070010.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 12111012210021 its reverse (12001221011121), we get a palindrome (24112233221142).

The spelling of 12111012210021 in words is "twelve trillion, one hundred eleven billion, twelve million, two hundred ten thousand, twenty-one".