21100130323 has 4 divisors (see below), whose sum is σ = 21101611120. Its totient is φ = 21098649528.

The previous prime is 21100130297. The next prime is 21100130347. The reversal of 21100130323 is 32303100112.

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

It is a cyclic number.

It is not a de Polignac number, because 21100130323 - 2²¹ = 21098033171 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21100130297 and 21100130306.

It is not an unprimeable number, because it can be changed into a prime (21100130353) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 718815 + ... + 747592.

It is an arithmetic number, because the mean of its divisors is an integer number (5275402780).

Almost surely, 2^21100130323 is an apocalyptic number.

21100130323 is a deficient number, since it is larger than the sum of its proper divisors (1480797).

21100130323 is a wasteful number, since it uses less digits than its factorization.

21100130323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1480796.

The product of its (nonzero) digits is 108, while the sum is 16.

Adding to 21100130323 its reverse (32303100112), we get a palindrome (53403230435).

The spelling of 21100130323 in words is "twenty-one billion, one hundred million, one hundred thirty thousand, three hundred twenty-three".