121221022212121 has 8 divisors (see below), whose sum is σ = 130550715855560. Its totient is φ = 111892042801152.

The previous prime is 121221022212067. The next prime is 121221022212197. The reversal of 121221022212121 is 121212220122121.

It can be written as a sum of positive squares in 4 ways, for example, as 24344247452121 + 96876774760000 = 4933989^2 + 9842600^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 121221022212121 - 2²⁵ = 121220988657689 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 121221022212092 and 121221022212101.

It is not an unprimeable number, because it can be changed into a prime (121221022216121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 178205586 + ... + 178884523.

It is an arithmetic number, because the mean of its divisors is an integer number (16318839481945).

Almost surely, 2^{121221022212121} is an apocalyptic number.

It is an amenable number.

121221022212121 is a deficient number, since it is larger than the sum of its proper divisors (9329693643439).

121221022212121 is a wasteful number, since it uses less digits than its factorization.

121221022212121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 357116235.

The product of its (nonzero) digits is 256, while the sum is 22.

Adding to 121221022212121 its reverse (121212220122121), we get a palindrome (242433242334242).

The spelling of 121221022212121 in words is "one hundred twenty-one trillion, two hundred twenty-one billion, twenty-two million, two hundred twelve thousand, one hundred twenty-one".