21130332123 has 4 divisors (see below), whose sum is σ = 28173776168. Its totient is φ = 14086888080.

The previous prime is 21130332103. The next prime is 21130332143. The reversal of 21130332123 is 32123303112.

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

It is an interprime number because it is at equal distance from previous prime (21130332103) and next prime (21130332143).

It is not a de Polignac number, because 21130332123 - 2⁸ = 21130331867 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21130332123.

It is not an unprimeable number, because it can be changed into a prime (21130332103) 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, 3521722018 + ... + 3521722023.

It is an arithmetic number, because the mean of its divisors is an integer number (7043444042).

Almost surely, 2^21130332123 is an apocalyptic number.

21130332123 is a deficient number, since it is larger than the sum of its proper divisors (7043444045).

21130332123 is an equidigital number, since it uses as much as digits as its factorization.

21130332123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7043444044.

The product of its (nonzero) digits is 648, while the sum is 21.

Adding to 21130332123 its reverse (32123303112), we get a palindrome (53253635235).

The spelling of 21130332123 in words is "twenty-one billion, one hundred thirty million, three hundred thirty-two thousand, one hundred twenty-three".