121221111211 has 2 divisors, whose sum is σ = 121221111212. Its totient is φ = 121221111210.

The previous prime is 121221111199. The next prime is 121221111223. The reversal of 121221111211 is 112111122121.

It is a balanced prime because it is at equal distance from previous prime (121221111199) and next prime (121221111223).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121221111211 is a prime.

It is not a weakly prime, because it can be changed into another prime (121221111811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60610555605 + 60610555606.

It is an arithmetic number, because the mean of its divisors is an integer number (60610555606).

Almost surely, 2^121221111211 is an apocalyptic number.

121221111211 is a deficient number, since it is larger than the sum of its proper divisors (1).

121221111211 is an equidigital number, since it uses as much as digits as its factorization.

121221111211 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16, while the sum is 16.

Adding to 121221111211 its reverse (112111122121), we get a palindrome (233332233332).

The spelling of 121221111211 in words is "one hundred twenty-one billion, two hundred twenty-one million, one hundred eleven thousand, two hundred eleven".