121212121321 has 16 divisors (see below), whose sum is σ = 123878678400. Its totient is φ = 118560244608.

The previous prime is 121212121301. The next prime is 121212121333. The reversal of 121212121321 is 123121212121.

It is a cyclic number.

It is not a de Polignac number, because 121212121321 - 2¹³ = 121212113129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121212121301) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26538580 + ... + 26543146.

It is an arithmetic number, because the mean of its divisors is an integer number (7742417400).

Almost surely, 2^121212121321 is an apocalyptic number.

It is an amenable number.

121212121321 is a deficient number, since it is larger than the sum of its proper divisors (2666557079).

121212121321 is an equidigital number, since it uses as much as digits as its factorization.

121212121321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6048.

The product of its digits is 96, while the sum is 19.

Adding to 121212121321 its reverse (123121212121), we get a palindrome (244333333442).

The spelling of 121212121321 in words is "one hundred twenty-one billion, two hundred twelve million, one hundred twenty-one thousand, three hundred twenty-one".