12021102021 has 4 divisors (see below), whose sum is σ = 16028136032. Its totient is φ = 8014068012.

The previous prime is 12021102019. The next prime is 12021102043. The reversal of 12021102021 is 12020112021.

12021102021 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, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 12021102021 - 2¹ = 12021102019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12021101988 and 12021102006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12021102061) 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, 2003517001 + ... + 2003517006.

It is an arithmetic number, because the mean of its divisors is an integer number (4007034008).

Almost surely, 2^12021102021 is an apocalyptic number.

It is an amenable number.

12021102021 is a deficient number, since it is larger than the sum of its proper divisors (4007034011).

12021102021 is an equidigital number, since it uses as much as digits as its factorization.

12021102021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4007034010.

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

Adding to 12021102021 its reverse (12020112021), we get a palindrome (24041214042).

The spelling of 12021102021 in words is "twelve billion, twenty-one million, one hundred two thousand, twenty-one".