21100223323 has 4 divisors (see below), whose sum is σ = 21119635840. Its totient is φ = 21080810808.

The previous prime is 21100223237. The next prime is 21100223363. The reversal of 21100223323 is 32332200112.

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 21100223323 - 2⁹ = 21100222811 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 21100223323.

It is not an unprimeable number, because it can be changed into a prime (21100223363) 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, 9704628 + ... + 9706801.

It is an arithmetic number, because the mean of its divisors is an integer number (5279908960).

Almost surely, 2^21100223323 is an apocalyptic number.

21100223323 is a deficient number, since it is larger than the sum of its proper divisors (19412517).

21100223323 is a wasteful number, since it uses less digits than its factorization.

21100223323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19412516.

The product of its (nonzero) digits is 432, while the sum is 19.

Adding to 21100223323 its reverse (32332200112), we get a palindrome (53432423435).

The spelling of 21100223323 in words is "twenty-one billion, one hundred million, two hundred twenty-three thousand, three hundred twenty-three".