121212123321 has 16 divisors (see below), whose sum is σ = 166084592384. Its totient is φ = 78576511104.

The previous prime is 121212123299. The next prime is 121212123349. The reversal of 121212123321 is 123321212121.

It is not a de Polignac number, because 121212123321 - 2⁵ = 121212123289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121212122321) 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, 145585 + ... + 513438.

It is an arithmetic number, because the mean of its divisors is an integer number (10380287024).

Almost surely, 2^121212123321 is an apocalyptic number.

It is an amenable number.

121212123321 is a deficient number, since it is larger than the sum of its proper divisors (44872469063).

121212123321 is a wasteful number, since it uses less digits than its factorization.

121212123321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 660720.

The product of its digits is 288, while the sum is 21.

Adding to 121212123321 its reverse (123321212121), we get a palindrome (244533335442).

The spelling of 121212123321 in words is "one hundred twenty-one billion, two hundred twelve million, one hundred twenty-three thousand, three hundred twenty-one".