12111020000021 has 4 divisors (see below), whose sum is σ = 12111029322252. Its totient is φ = 12111010677792.

The previous prime is 12111019999937. The next prime is 12111020000071. The reversal of 12111020000021 is 12000002011121.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 12084974559025 + 26045440996 = 3476345^2 + 161386^2 .

It is a cyclic number.

It is not a de Polignac number, because 12111020000021 - 2⁴² = 7712973488917 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12111019999957 and 12111020000011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12111020000071) 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, 2320646 + ... + 5441271.

It is an arithmetic number, because the mean of its divisors is an integer number (3027757330563).

Almost surely, 2^{12111020000021} is an apocalyptic number.

It is an amenable number.

12111020000021 is a deficient number, since it is larger than the sum of its proper divisors (9322231).

12111020000021 is an equidigital number, since it uses as much as digits as its factorization.

12111020000021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9322230.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 12111020000021 its reverse (12000002011121), we get a palindrome (24111022011142).

The spelling of 12111020000021 in words is "twelve trillion, one hundred eleven billion, twenty million, twenty-one", and thus it is an aban number.