2111815867 has 6 divisors (see below), whose sum is σ = 2456602188. Its totient is φ = 1810127844.

The previous prime is 2111815861. The next prime is 2111815903. The reversal of 2111815867 is 7685181112.

It is not a de Polignac number, because 2111815867 - 2¹⁵ = 2111783099 is a prime.

It is a super-2 number, since 2×2111815867² = 8919532512225923378, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2111815861) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 21549093 + ... + 21549190.

It is an arithmetic number, because the mean of its divisors is an integer number (409433698).

Almost surely, 2^2111815867 is an apocalyptic number.

2111815867 is a deficient number, since it is larger than the sum of its proper divisors (344786321).

2111815867 is an equidigital number, since it uses as much as digits as its factorization.

2111815867 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43098297 (or 43098290 counting only the distinct ones).

The product of its digits is 26880, while the sum is 40.

The square root of 2111815867 is about 45954.4977885734. The cubic root of 2111815867 is about 1282.9764447456.

Adding to 2111815867 its reverse (7685181112), we get a palindrome (9796996979).

The spelling of 2111815867 in words is "two billion, one hundred eleven million, eight hundred fifteen thousand, eight hundred sixty-seven".