2181256903 has 24 divisors (see below), whose sum is σ = 2570253120. Its totient is φ = 1845547200.

The previous prime is 2181256901. The next prime is 2181256919. The reversal of 2181256903 is 3096521812.

It is not a de Polignac number, because 2181256903 - 2¹ = 2181256901 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2181256901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3033378 + ... + 3034096.

It is an arithmetic number, because the mean of its divisors is an integer number (107093880).

Almost surely, 2^2181256903 is an apocalyptic number.

2181256903 is a deficient number, since it is larger than the sum of its proper divisors (388996217).

2181256903 is a wasteful number, since it uses less digits than its factorization.

2181256903 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1447 (or 1440 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 37.

The square root of 2181256903 is about 46703.9281324387. The cubic root of 2181256903 is about 1296.8874061177.

The spelling of 2181256903 in words is "two billion, one hundred eighty-one million, two hundred fifty-six thousand, nine hundred three".