121211110021211 has 4 divisors (see below), whose sum is σ = 138526982881392. Its totient is φ = 103895237161032.

The previous prime is 121211110021091. The next prime is 121211110021229. The reversal of 121211110021211 is 112120011112121.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121211110021211 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 121211110021211.

It is not an unprimeable number, because it can be changed into a prime (121211110021711) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8657936430080 + ... + 8657936430093.

It is an arithmetic number, because the mean of its divisors is an integer number (34631745720348).

Almost surely, 2^{121211110021211} is an apocalyptic number.

121211110021211 is a deficient number, since it is larger than the sum of its proper divisors (17315872860181).

121211110021211 is an equidigital number, since it uses as much as digits as its factorization.

121211110021211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17315872860180.

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

Adding to 121211110021211 its reverse (112120011112121), we get a palindrome (233331121133332).

The spelling of 121211110021211 in words is "one hundred twenty-one trillion, two hundred eleven billion, one hundred ten million, twenty-one thousand, two hundred eleven".