121011111997 has 2 divisors, whose sum is σ = 121011111998. Its totient is φ = 121011111996.

The previous prime is 121011111961. The next prime is 121011112063. The reversal of 121011111997 is 799111110121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 92282895961 + 28728216036 = 303781^2 + 169494^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121011111997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121011114997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60505555998 + 60505555999.

It is an arithmetic number, because the mean of its divisors is an integer number (60505555999).

Almost surely, 2^121011111997 is an apocalyptic number.

It is an amenable number.

121011111997 is a deficient number, since it is larger than the sum of its proper divisors (1).

121011111997 is an equidigital number, since it uses as much as digits as its factorization.

121011111997 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1134, while the sum is 34.

The spelling of 121011111997 in words is "one hundred twenty-one billion, eleven million, one hundred eleven thousand, nine hundred ninety-seven".