12011111021021 has 24 divisors (see below), whose sum is σ = 14821000430976. Its totient is φ = 9530789195520.

The previous prime is 12011111021011. The next prime is 12011111021029. The reversal of 12011111021021 is 12012011111021.

It is not a de Polignac number, because 12011111021021 - 2⁶ = 12011111020957 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12011111020987 and 12011111021005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12011111021029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 48542801 + ... + 48789606.

It is an arithmetic number, because the mean of its divisors is an integer number (617541684624).

Almost surely, 2^{12011111021021} is an apocalyptic number.

It is an amenable number.

12011111021021 is a deficient number, since it is larger than the sum of its proper divisors (2809889409955).

12011111021021 is an equidigital number, since it uses as much as digits as its factorization.

12011111021021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97332509 (or 97332492 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 14.

Adding to 12011111021021 its reverse (12012011111021), we get a palindrome (24023122132042).

The spelling of 12011111021021 in words is "twelve trillion, eleven billion, one hundred eleven million, twenty-one thousand, twenty-one".