12211122021 has 16 divisors (see below), whose sum is σ = 18674607744. Its totient is φ = 6952590144.

The previous prime is 12211122013. The next prime is 12211122043. The reversal of 12211122021 is 12022111221.

It is not a de Polignac number, because 12211122021 - 2³ = 12211122013 is a prime.

It is a super-2 number, since 2×12211122021² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12211122221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1043790 + ... + 1055423.

It is an arithmetic number, because the mean of its divisors is an integer number (1167162984).

Almost surely, 2^12211122021 is an apocalyptic number.

It is an amenable number.

12211122021 is a deficient number, since it is larger than the sum of its proper divisors (6463485723).

12211122021 is a wasteful number, since it uses less digits than its factorization.

12211122021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2099500.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 12211122021 its reverse (12022111221), we get a palindrome (24233233242).

The spelling of 12211122021 in words is "twelve billion, two hundred eleven million, one hundred twenty-two thousand, twenty-one".