121212002121221 has 32 divisors (see below), whose sum is σ = 135471965529600. Its totient is φ = 107520286236480.

The previous prime is 121212002121187. The next prime is 121212002121241. The reversal of 121212002121221 is 122121200212121.

It is a cyclic number.

It is not a de Polignac number, because 121212002121221 - 2¹⁰ = 121212002120197 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121212002121193 and 121212002121202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121212002121241) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 386216855 + ... + 386530571.

It is an arithmetic number, because the mean of its divisors is an integer number (4233498922800).

Almost surely, 2^{121212002121221} is an apocalyptic number.

121212002121221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

121212002121221 is a deficient number, since it is larger than the sum of its proper divisors (14259963408379).

121212002121221 is a wasteful number, since it uses less digits than its factorization.

121212002121221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 318209.

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 121212002121221 its reverse (122121200212121), we get a palindrome (243333202333342).

The spelling of 121212002121221 in words is "one hundred twenty-one trillion, two hundred twelve billion, two million, one hundred twenty-one thousand, two hundred twenty-one".