121221212012121 has 16 divisors (see below), whose sum is σ = 174178125658880. Its totient is φ = 74547569721600.

The previous prime is 121221212012119. The next prime is 121221212012149. The reversal of 121221212012121 is 121210212122121.

It is not a de Polignac number, because 121221212012121 - 2¹ = 121221212012119 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121221212012111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1043674705 + ... + 1043790846.

It is an arithmetic number, because the mean of its divisors is an integer number (10886132853680).

Almost surely, 2^{121221212012121} is an apocalyptic number.

It is an amenable number.

121221212012121 is a deficient number, since it is larger than the sum of its proper divisors (52956913646759).

121221212012121 is a wasteful number, since it uses less digits than its factorization.

121221212012121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2087467056.

The product of its (nonzero) digits is 128, while the sum is 21.

Adding to 121221212012121 its reverse (121210212122121), we get a palindrome (242431424134242).

The spelling of 121221212012121 in words is "one hundred twenty-one trillion, two hundred twenty-one billion, two hundred twelve million, twelve thousand, one hundred twenty-one".