121011011999 has 2 divisors, whose sum is σ = 121011012000. Its totient is φ = 121011011998.

The previous prime is 121011011971. The next prime is 121011012013. The reversal of 121011011999 is 999110110121.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121011011999 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121011011909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60505505999 + 60505506000.

It is an arithmetic number, because the mean of its divisors is an integer number (60505506000).

Almost surely, 2^121011011999 is an apocalyptic number.

121011011999 is a deficient number, since it is larger than the sum of its proper divisors (1).

121011011999 is an equidigital number, since it uses as much as digits as its factorization.

121011011999 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1458, while the sum is 35.

The spelling of 121011011999 in words is "one hundred twenty-one billion, eleven million, eleven thousand, nine hundred ninety-nine".