12222121021 has 16 divisors (see below), whose sum is σ = 14053253760. Its totient is φ = 10525453120.

The previous prime is 12222121001. The next prime is 12222121031. The reversal of 12222121021 is 12012122221.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 12222121021 - 2¹³ = 12222112829 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12222120986 and 12222121004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12222121001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 344545 + ... + 378358.

It is an arithmetic number, because the mean of its divisors is an integer number (878328360).

Almost surely, 2^12222121021 is an apocalyptic number.

12222121021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12222121021 is a deficient number, since it is larger than the sum of its proper divisors (1831132739).

12222121021 is a wasteful number, since it uses less digits than its factorization.

12222121021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 722996.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 12222121021 its reverse (12012122221), we get a palindrome (24234243242).

The spelling of 12222121021 in words is "twelve billion, two hundred twenty-two million, one hundred twenty-one thousand, twenty-one".