2181236103 has 24 divisors (see below), whose sum is σ = 3226663440. Its totient is φ = 1419143040.

The previous prime is 2181236093. The next prime is 2181236117. The reversal of 2181236103 is 3016321812.

It is a happy number.

2181236103 is a `hidden beast` number, since 21 + 8 + 1 + 23 + 610 + 3 = 666.

It is not a de Polignac number, because 2181236103 - 2⁹ = 2181235591 is a prime.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2181237103) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 892363 + ... + 894803.

It is an arithmetic number, because the mean of its divisors is an integer number (134444310).

Almost surely, 2^2181236103 is an apocalyptic number.

2181236103 is a deficient number, since it is larger than the sum of its proper divisors (1045427337).

2181236103 is a wasteful number, since it uses less digits than its factorization.

2181236103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4799 (or 4796 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 2181236103 is about 46703.7054525655. The cubic root of 2181236103 is about 1296.8832838242.

Adding to 2181236103 its reverse (3016321812), we get a palindrome (5197557915).

It can be divided in two parts, 218 and 1236103, that added together give a palindrome (1236321).

The spelling of 2181236103 in words is "two billion, one hundred eighty-one million, two hundred thirty-six thousand, one hundred three".