2172338881 has 2 divisors, whose sum is σ = 2172338882. Its totient is φ = 2172338880.

The previous prime is 2172338879. The next prime is 2172338929. The reversal of 2172338881 is 1888332712.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1961072656 + 211266225 = 44284^2 + 14535^2 .

It is a cyclic number.

It is not a de Polignac number, because 2172338881 - 2¹ = 2172338879 is a prime.

It is a super-2 number, since 2×2172338881² = 9438112427808664322, which contains 22 as substring.

Together with 2172338879, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (2172332881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1086169440 + 1086169441.

It is an arithmetic number, because the mean of its divisors is an integer number (1086169441).

Almost surely, 2^2172338881 is an apocalyptic number.

It is an amenable number.

2172338881 is a deficient number, since it is larger than the sum of its proper divisors (1).

2172338881 is an equidigital number, since it uses as much as digits as its factorization.

2172338881 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 129024, while the sum is 43.

The square root of 2172338881 is about 46608.3563430422. The cubic root of 2172338881 is about 1295.1175598270.

The spelling of 2172338881 in words is "two billion, one hundred seventy-two million, three hundred thirty-eight thousand, eight hundred eighty-one".