2172116399 has 2 divisors, whose sum is σ = 2172116400. Its totient is φ = 2172116398.

The previous prime is 2172116393. The next prime is 2172116449. The reversal of 2172116399 is 9936112712.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2172116399 - 2¹⁶ = 2172050863 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2172116393) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1086058199 + 1086058200.

It is an arithmetic number, because the mean of its divisors is an integer number (1086058200).

Almost surely, 2^2172116399 is an apocalyptic number.

2172116399 is a deficient number, since it is larger than the sum of its proper divisors (1).

2172116399 is an equidigital number, since it uses as much as digits as its factorization.

2172116399 is an evil number, because the sum of its binary digits is even.

The product of its digits is 40824, while the sum is 41.

The square root of 2172116399 is about 46605.9695639947. The cubic root of 2172116399 is about 1295.0733447823.

The spelling of 2172116399 in words is "two billion, one hundred seventy-two million, one hundred sixteen thousand, three hundred ninety-nine".