121220021999911 has 2 divisors, whose sum is σ = 121220021999912. Its totient is φ = 121220021999910.

The previous prime is 121220021999837. The next prime is 121220022000061. The reversal of 121220021999911 is 119999120022121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 121220021999911 - 2²⁷ = 121219887782183 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121220021999411) 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 as a sum of consecutive naturals, namely, 60610010999955 + 60610010999956.

It is an arithmetic number, because the mean of its divisors is an integer number (60610010999956).

Almost surely, 2^{121220021999911} is an apocalyptic number.

121220021999911 is a deficient number, since it is larger than the sum of its proper divisors (1).

121220021999911 is an equidigital number, since it uses as much as digits as its factorization.

121220021999911 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 104976, while the sum is 49.

The spelling of 121220021999911 in words is "one hundred twenty-one trillion, two hundred twenty billion, twenty-one million, nine hundred ninety-nine thousand, nine hundred eleven".