121221100100011 has 2 divisors, whose sum is σ = 121221100100012. Its totient is φ = 121221100100010.

The previous prime is 121221100099999. The next prime is 121221100100017. The reversal of 121221100100011 is 110001001122121.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 121221100100011 - 2⁹ = 121221100099499 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 121221100099964 and 121221100100000.

It is not a weakly prime, because it can be changed into another prime (121221100100017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60610550050005 + 60610550050006.

It is an arithmetic number, because the mean of its divisors is an integer number (60610550050006).

Almost surely, 2^{121221100100011} is an apocalyptic number.

121221100100011 is a deficient number, since it is larger than the sum of its proper divisors (1).

121221100100011 is an equidigital number, since it uses as much as digits as its factorization.

121221100100011 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 121221100100011 its reverse (110001001122121), we get a palindrome (231222101222132).

The spelling of 121221100100011 in words is "one hundred twenty-one trillion, two hundred twenty-one billion, one hundred million, one hundred thousand, eleven".