2161715111 has 4 divisors (see below), whose sum is σ = 2161812072. Its totient is φ = 2161618152.

The previous prime is 2161715093. The next prime is 2161715113. The reversal of 2161715111 is 1115171612.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2161715111 is a prime.

It is a super-2 number, since 2×2161715111² = 9346024442251484642, which contains 22 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 (2161715113) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3641 + ... + 65853.

It is an arithmetic number, because the mean of its divisors is an integer number (540453018).

Almost surely, 2^2161715111 is an apocalyptic number.

2161715111 is a deficient number, since it is larger than the sum of its proper divisors (96961).

2161715111 is an equidigital number, since it uses as much as digits as its factorization.

2161715111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96960.

The product of its digits is 420, while the sum is 26.

The square root of 2161715111 is about 46494.2481496367. The cubic root of 2161715111 is about 1293.0028618949.

Adding to 2161715111 its reverse (1115171612), we get a palindrome (3276886723).

The spelling of 2161715111 in words is "two billion, one hundred sixty-one million, seven hundred fifteen thousand, one hundred eleven".