121201011121211 has 16 divisors (see below), whose sum is σ = 139861172505600. Its totient is φ = 102877295829408.

The previous prime is 121201011121189. The next prime is 121201011121243. The reversal of 121201011121211 is 112121110102121.

It is a cyclic number.

It is not a de Polignac number, because 121201011121211 - 2¹⁴ = 121201011104827 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 121201011121211.

It is not an unprimeable number, because it can be changed into a prime (121201011121511) 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, 130498985 + ... + 131424453.

It is an arithmetic number, because the mean of its divisors is an integer number (8741323281600).

Almost surely, 2^{121201011121211} is an apocalyptic number.

121201011121211 is a deficient number, since it is larger than the sum of its proper divisors (18660161384389).

121201011121211 is a wasteful number, since it uses less digits than its factorization.

121201011121211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1107218.

The product of its (nonzero) digits is 16, while the sum is 17.

Adding to 121201011121211 its reverse (112121110102121), we get a palindrome (233322121223332).

The spelling of 121201011121211 in words is "one hundred twenty-one trillion, two hundred one billion, eleven million, one hundred twenty-one thousand, two hundred eleven".