2121232103 has 4 divisors (see below), whose sum is σ = 2246010480. Its totient is φ = 1996453728.

The previous prime is 2121232051. The next prime is 2121232177. The reversal of 2121232103 is 3012321212.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2121232103 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17), and also a Moran number because the ratio is a prime number: 124778359 = 2121232103 / (2 + 1 + 2 + 1 + 2 + 3 + 2 + 1 + 0 + 3).

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 (2121232193) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 62389163 + ... + 62389196.

It is an arithmetic number, because the mean of its divisors is an integer number (561502620).

Almost surely, 2^2121232103 is an apocalyptic number.

2121232103 is a deficient number, since it is larger than the sum of its proper divisors (124778377).

2121232103 is a wasteful number, since it uses less digits than its factorization.

2121232103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124778376.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 2121232103 is about 46056.8355730178. The cubic root of 2121232103 is about 1284.8804772074.

Adding to 2121232103 its reverse (3012321212), we get a palindrome (5133553315).

The spelling of 2121232103 in words is "two billion, one hundred twenty-one million, two hundred thirty-two thousand, one hundred three".