2172167811 has 24 divisors (see below), whose sum is σ = 3428233536. Its totient is φ = 1314379440.

The previous prime is 2172167807. The next prime is 2172167813. The reversal of 2172167811 is 1187612712.

It is not a de Polignac number, because 2172167811 - 2² = 2172167807 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2172167813) 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 in 23 ways as a sum of consecutive naturals, for example, 46596 + ... + 80718.

It is an arithmetic number, because the mean of its divisors is an integer number (142843064).

Almost surely, 2^2172167811 is an apocalyptic number.

2172167811 is a deficient number, since it is larger than the sum of its proper divisors (1256065725).

2172167811 is a wasteful number, since it uses less digits than its factorization.

2172167811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34783 (or 34780 counting only the distinct ones).

The product of its digits is 9408, while the sum is 36.

The square root of 2172167811 is about 46606.5211209762. The cubic root of 2172167811 is about 1295.0835624338.

The spelling of 2172167811 in words is "two billion, one hundred seventy-two million, one hundred sixty-seven thousand, eight hundred eleven".