12021122021 has 8 divisors (see below), whose sum is σ = 12563848920. Its totient is φ = 11486942208.

The previous prime is 12021121997. The next prime is 12021122033. The reversal of 12021122021 is 12022112021.

12021122021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 4081420996 + 7939701025 = 63886^2 + 89105^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12021122021 - 2¹⁰ = 12021120997 is a prime.

It is a super-2 number, since 2×12021122021² (a number of 21 digits) contains 22 as substring.

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 = 12021121987 and 12021122005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12021122081) 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 7 ways as a sum of consecutive naturals, for example, 2133896 + ... + 2139521.

It is an arithmetic number, because the mean of its divisors is an integer number (1570481115).

Almost surely, 2^12021122021 is an apocalyptic number.

It is an amenable number.

12021122021 is a deficient number, since it is larger than the sum of its proper divisors (542726899).

12021122021 is an equidigital number, since it uses as much as digits as its factorization.

12021122021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4273543.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 12021122021 its reverse (12022112021), we get a palindrome (24043234042).

The spelling of 12021122021 in words is "twelve billion, twenty-one million, one hundred twenty-two thousand, twenty-one".