2121000221999 has 8 divisors (see below), whose sum is σ = 2125275134208. Its totient is φ = 2116726761240.

The previous prime is 2121000221983. The next prime is 2121000222043. The reversal of 2121000221999 is 9991220001212.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2121000221999 - 2⁴ = 2121000221983 is a prime.

It is a super-3 number, since 3×2121000221999³ (a number of 38 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121000221099) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2586794 + ... + 3306584.

It is an arithmetic number, because the mean of its divisors is an integer number (265659391776).

Almost surely, 2^{2121000221999} is an apocalyptic number.

2121000221999 is a deficient number, since it is larger than the sum of its proper divisors (4274912209).

2121000221999 is an equidigital number, since it uses as much as digits as its factorization.

2121000221999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 725725.

The product of its (nonzero) digits is 11664, while the sum is 38.

The spelling of 2121000221999 in words is "two trillion, one hundred twenty-one billion, two hundred twenty-one thousand, nine hundred ninety-nine".