2181408813 has 48 divisors (see below), whose sum is σ = 3362014656. Its totient is φ = 1412588160.

The previous prime is 2181408811. The next prime is 2181408833. The reversal of 2181408813 is 3188041812.

It is not a de Polignac number, because 2181408813 - 2¹ = 2181408811 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2181408811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3715906 + ... + 3716492.

It is an arithmetic number, because the mean of its divisors is an integer number (70041972).

Almost surely, 2^2181408813 is an apocalyptic number.

It is an amenable number.

2181408813 is a deficient number, since it is larger than the sum of its proper divisors (1180605843).

2181408813 is an equidigital number, since it uses as much as digits as its factorization.

2181408813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1016 (or 1004 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 36.

The square root of 2181408813 is about 46705.5544127248. The cubic root of 2181408813 is about 1296.9175119392.

The spelling of 2181408813 in words is "two billion, one hundred eighty-one million, four hundred eight thousand, eight hundred thirteen".