121211222122121 has 16 divisors (see below), whose sum is σ = 124768289378304. Its totient is φ = 117689637431184.

The previous prime is 121211222122103. The next prime is 121211222122171. The reversal of 121211222122121 is 121221222112121.

It is a cyclic number.

It is not a de Polignac number, because 121211222122121 - 2¹⁴ = 121211222105737 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121211222122171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6194201 + ... + 16756806.

It is an arithmetic number, because the mean of its divisors is an integer number (7798018086144).

Almost surely, 2^{121211222122121} is an apocalyptic number.

It is an amenable number.

121211222122121 is a deficient number, since it is larger than the sum of its proper divisors (3557067256183).

121211222122121 is a wasteful number, since it uses less digits than its factorization.

121211222122121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22951780.

The product of its digits is 256, while the sum is 23.

Adding to 121211222122121 its reverse (121221222112121), we get a palindrome (242432444234242).

The spelling of 121211222122121 in words is "one hundred twenty-one trillion, two hundred eleven billion, two hundred twenty-two million, one hundred twenty-two thousand, one hundred twenty-one".