12021220011 has 4 divisors (see below), whose sum is σ = 16028293352. Its totient is φ = 8014146672.

The previous prime is 12021219929. The next prime is 12021220019. The reversal of 12021220011 is 11002212021.

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

It is not a de Polignac number, because 12021220011 - 2⁹ = 12021219499 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12021220019) 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, 2003536666 + ... + 2003536671.

It is an arithmetic number, because the mean of its divisors is an integer number (4007073338).

Almost surely, 2^12021220011 is an apocalyptic number.

12021220011 is a deficient number, since it is larger than the sum of its proper divisors (4007073341).

12021220011 is an equidigital number, since it uses as much as digits as its factorization.

12021220011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4007073340.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 12021220011 its reverse (11002212021), we get a palindrome (23023432032).

The spelling of 12021220011 in words is "twelve billion, twenty-one million, two hundred twenty thousand, eleven".