121020121011999 has 16 divisors (see below), whose sum is σ = 176154199050240. Its totient is φ = 73293472834560.

The previous prime is 121020121011983. The next prime is 121020121012003. The reversal of 121020121011999 is 999110121020121.

It is not a de Polignac number, because 121020121011999 - 2⁴ = 121020121011983 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121020121018999) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1301329087 + ... + 1301422080.

It is an arithmetic number, because the mean of its divisors is an integer number (11009637440640).

Almost surely, 2^{121020121011999} is an apocalyptic number.

121020121011999 is a deficient number, since it is larger than the sum of its proper divisors (55134078038241).

121020121011999 is a wasteful number, since it uses less digits than its factorization.

121020121011999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2602752590.

The product of its (nonzero) digits is 5832, while the sum is 39.

The spelling of 121020121011999 in words is "one hundred twenty-one trillion, twenty billion, one hundred twenty-one million, eleven thousand, nine hundred ninety-nine".