12011230021 has 4 divisors (see below), whose sum is σ = 13727120032. Its totient is φ = 10295340012.

The previous prime is 12011230013. The next prime is 12011230027. The reversal of 12011230021 is 12003211021.

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 12011230021 - 2³ = 12011230013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12011229983 and 12011230010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12011230027) 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, 857944995 + ... + 857945008.

It is an arithmetic number, because the mean of its divisors is an integer number (3431780008).

Almost surely, 2^12011230021 is an apocalyptic number.

It is an amenable number.

12011230021 is a deficient number, since it is larger than the sum of its proper divisors (1715890011).

12011230021 is an equidigital number, since it uses as much as digits as its factorization.

12011230021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1715890010.

The product of its (nonzero) digits is 24, while the sum is 13.

Adding to 12011230021 its reverse (12003211021), we get a palindrome (24014441042).

The spelling of 12011230021 in words is "twelve billion, eleven million, two hundred thirty thousand, twenty-one".