2181343667 has 12 divisors (see below), whose sum is σ = 2307828264. Its totient is φ = 2061322560.

The previous prime is 2181343639. The next prime is 2181343669. The reversal of 2181343667 is 7663431812.

It is not a de Polignac number, because 2181343667 - 2¹⁰ = 2181342643 is a prime.

It is a super-2 number, since 2×2181343667² = 9516520387122013778, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2181343669) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 19067 + ... + 68747.

It is an arithmetic number, because the mean of its divisors is an integer number (192319022).

Almost surely, 2^2181343667 is an apocalyptic number.

2181343667 is a deficient number, since it is larger than the sum of its proper divisors (126484597).

2181343667 is an equidigital number, since it uses as much as digits as its factorization.

2181343667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49810 (or 49787 counting only the distinct ones).

The product of its digits is 145152, while the sum is 41.

The square root of 2181343667 is about 46704.8569958200. The cubic root of 2181343667 is about 1296.9046013484.

The spelling of 2181343667 in words is "two billion, one hundred eighty-one million, three hundred forty-three thousand, six hundred sixty-seven".