12222122001221 has 24 divisors (see below), whose sum is σ = 14164402348800. Its totient is φ = 10456887680000.

The previous prime is 12222122001203. The next prime is 12222122001277. The reversal of 12222122001221 is 12210022122221.

It is not a de Polignac number, because 12222122001221 - 2⁶ = 12222122001157 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 12222122001193 and 12222122001202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12222122001281) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 68574221 + ... + 68752221.

It is an arithmetic number, because the mean of its divisors is an integer number (590183431200).

Almost surely, 2^{12222122001221} is an apocalyptic number.

12222122001221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12222122001221 is a deficient number, since it is larger than the sum of its proper divisors (1942280347579).

12222122001221 is a wasteful number, since it uses less digits than its factorization.

12222122001221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 199645 (or 199628 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 12222122001221 its reverse (12210022122221), we get a palindrome (24432144123442).

The spelling of 12222122001221 in words is "twelve trillion, two hundred twenty-two billion, one hundred twenty-two million, one thousand, two hundred twenty-one".