12121320222 has 64 divisors (see below), whose sum is σ = 29609521920. Its totient is φ = 3645064800.

The previous prime is 12121320193. The next prime is 12121320223. The reversal of 12121320222 is 22202312121.

12121320222 is a `hidden beast` number, since 1 + 2 + 121 + 320 + 222 = 666.

It is a super-2 number, since 2×12121320222² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 12121320195 and 12121320204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12121320223) 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 31 ways as a sum of consecutive naturals, for example, 73 + ... + 155700.

It is an arithmetic number, because the mean of its divisors is an integer number (462648780).

Almost surely, 2^12121320222 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12121320222, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14804760960).

12121320222 is an abundant number, since it is smaller than the sum of its proper divisors (17488201698).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12121320222 is a wasteful number, since it uses less digits than its factorization.

12121320222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155926 (or 155920 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 12121320222 its reverse (22202312121), we get a palindrome (34323632343).

The spelling of 12121320222 in words is "twelve billion, one hundred twenty-one million, three hundred twenty thousand, two hundred twenty-two".