12022121221 has 8 divisors (see below), whose sum is σ = 13299761088. Its totient is φ = 10775268000.

The previous prime is 12022121197. The next prime is 12022121231. The reversal of 12022121221 is 12212122021.

It is a happy number.

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 12022121221 - 2⁷ = 12022121093 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12022121195 and 12022121204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12022121231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7695840 + ... + 7697401.

It is an arithmetic number, because the mean of its divisors is an integer number (1662470136).

Almost surely, 2^12022121221 is an apocalyptic number.

12022121221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12022121221 is a deficient number, since it is larger than the sum of its proper divisors (1277639867).

12022121221 is a wasteful number, since it uses less digits than its factorization.

12022121221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15393323.

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

Adding to 12022121221 its reverse (12212122021), we get a palindrome (24234243242).

The spelling of 12022121221 in words is "twelve billion, twenty-two million, one hundred twenty-one thousand, two hundred twenty-one".