121221120011 has 2 divisors, whose sum is σ = 121221120012. Its totient is φ = 121221120010.

The previous prime is 121221119947. The next prime is 121221120029. The reversal of 121221120011 is 110021122121.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 121221120011 - 2⁶ = 121221119947 is a prime.

It is not a weakly prime, because it can be changed into another prime (121221120511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60610560005 + 60610560006.

It is an arithmetic number, because the mean of its divisors is an integer number (60610560006).

Almost surely, 2^121221120011 is an apocalyptic number.

121221120011 is a deficient number, since it is larger than the sum of its proper divisors (1).

121221120011 is an equidigital number, since it uses as much as digits as its factorization.

121221120011 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 121221120011 its reverse (110021122121), we get a palindrome (231242242132).

The spelling of 121221120011 in words is "one hundred twenty-one billion, two hundred twenty-one million, one hundred twenty thousand, eleven".