12011210021 has 4 divisors (see below), whose sum is σ = 12011432844. Its totient is φ = 12010987200.

The previous prime is 12011210009. The next prime is 12011210023. The reversal of 12011210021 is 12001211021.

12011210021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5935007521 + 6076202500 = 77039^2 + 77950^2 .

It is a cyclic number.

It is not a de Polignac number, because 12011210021 - 2⁶ = 12011209957 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12011209984 and 12011210011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12011210023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25661 + ... + 157101.

It is an arithmetic number, because the mean of its divisors is an integer number (3002858211).

Almost surely, 2^12011210021 is an apocalyptic number.

It is an amenable number.

12011210021 is a deficient number, since it is larger than the sum of its proper divisors (222823).

12011210021 is an equidigital number, since it uses as much as digits as its factorization.

12011210021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 222822.

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

Adding to 12011210021 its reverse (12001211021), we get a palindrome (24012421042).

The spelling of 12011210021 in words is "twelve billion, eleven million, two hundred ten thousand, twenty-one".