2121020321999 has 2 divisors, whose sum is σ = 2121020322000. Its totient is φ = 2121020321998.

The previous prime is 2121020321983. The next prime is 2121020322041. The reversal of 2121020321999 is 9991230201212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2121020321999 - 2⁴ = 2121020321983 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2121020321909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1060510160999 + 1060510161000.

It is an arithmetic number, because the mean of its divisors is an integer number (1060510161000).

Almost surely, 2^{2121020321999} is an apocalyptic number.

2121020321999 is a deficient number, since it is larger than the sum of its proper divisors (1).

2121020321999 is an equidigital number, since it uses as much as digits as its factorization.

2121020321999 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 34992, while the sum is 41.

The spelling of 2121020321999 in words is "two trillion, one hundred twenty-one billion, twenty million, three hundred twenty-one thousand, nine hundred ninety-nine".