12011120021 has 4 divisors (see below), whose sum is σ = 12064032672. Its totient is φ = 11958207372.

The previous prime is 12011119997. The next prime is 12011120029. The reversal of 12011120021 is 12002111021.

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 a cyclic number.

It is not a de Polignac number, because 12011120021 - 2¹⁰ = 12011118997 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 12011119984 and 12011120011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12011120029) 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, 26455985 + ... + 26456438.

It is an arithmetic number, because the mean of its divisors is an integer number (3016008168).

Almost surely, 2^12011120021 is an apocalyptic number.

It is an amenable number.

12011120021 is a deficient number, since it is larger than the sum of its proper divisors (52912651).

12011120021 is an equidigital number, since it uses as much as digits as its factorization.

12011120021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52912650.

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

Adding to 12011120021 its reverse (12002111021), we get a palindrome (24013231042).

The spelling of 12011120021 in words is "twelve billion, eleven million, one hundred twenty thousand, twenty-one".