2121021011999 has 2 divisors, whose sum is σ = 2121021012000. Its totient is φ = 2121021011998.

The previous prime is 2121021011957. The next prime is 2121021012013. The reversal of 2121021011999 is 9991101201212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2121021011999 - 2⁴⁰ = 1021509384223 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2121021016999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1060510505999 + 1060510506000.

It is an arithmetic number, because the mean of its divisors is an integer number (1060510506000).

Almost surely, 2^{2121021011999} is an apocalyptic number.

2121021011999 is a deficient number, since it is larger than the sum of its proper divisors (1).

2121021011999 is an equidigital number, since it uses as much as digits as its factorization.

2121021011999 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5832, while the sum is 38.

The spelling of 2121021011999 in words is "two trillion, one hundred twenty-one billion, twenty-one million, eleven thousand, nine hundred ninety-nine".