2111861984 has 12 divisors (see below), whose sum is σ = 4157728344. Its totient is φ = 1055930976.

The previous prime is 2111861977. The next prime is 2111862013. The reversal of 2111861984 is 4891681112.

It is a super-2 number, since 2×2111861984² = 8919922078928832512, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32997812 + ... + 32997875.

It is an arithmetic number, because the mean of its divisors is an integer number (346477362).

Almost surely, 2^2111861984 is an apocalyptic number.

It is an amenable number.

2111861984 is a deficient number, since it is larger than the sum of its proper divisors (2045866360).

2111861984 is an equidigital number, since it uses as much as digits as its factorization.

2111861984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65995697 (or 65995689 counting only the distinct ones).

The product of its digits is 27648, while the sum is 41.

The square root of 2111861984 is about 45954.9995539114. Note that the first 3 decimals coincide. The cubic root of 2111861984 is about 1282.9857837217.

Adding to 2111861984 its sum of digits (41), we get a square (2111862025 = 45955²).

The spelling of 2111861984 in words is "two billion, one hundred eleven million, eight hundred sixty-one thousand, nine hundred eighty-four".