2121321199 has 2 divisors, whose sum is σ = 2121321200. Its totient is φ = 2121321198.

The previous prime is 2121321197. The next prime is 2121321233. The reversal of 2121321199 is 9911231212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2121321199 - 2¹ = 2121321197 is a prime.

Together with 2121321197, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 2121321199.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2121321197) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1060660599 + 1060660600.

It is an arithmetic number, because the mean of its divisors is an integer number (1060660600).

Almost surely, 2^2121321199 is an apocalyptic number.

2121321199 is a deficient number, since it is larger than the sum of its proper divisors (1).

2121321199 is an equidigital number, since it uses as much as digits as its factorization.

2121321199 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1944, while the sum is 31.

The square root of 2121321199 is about 46057.8028025654. The cubic root of 2121321199 is about 1284.8984661407.

The spelling of 2121321199 in words is "two billion, one hundred twenty-one million, three hundred twenty-one thousand, one hundred ninety-nine".