21100312323 has 28 divisors (see below), whose sum is σ = 31926355120. Its totient is φ = 13937768496.

The previous prime is 21100312273. The next prime is 21100312327. The reversal of 21100312323 is 32321300112.

21100312323 is a `hidden beast` number, since 21 + 10 + 0 + 312 + 323 = 666.

It is not a de Polignac number, because 21100312323 - 2¹³ = 21100304131 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21100312296 and 21100312305.

It is not an unprimeable number, because it can be changed into a prime (21100312327) by changing a digit.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 53311 + ... + 212232.

Almost surely, 2^21100312323 is an apocalyptic number.

21100312323 is a deficient number, since it is larger than the sum of its proper divisors (10826042797).

21100312323 is an equidigital number, since it uses as much as digits as its factorization.

21100312323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 265670 (or 265655 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

Adding to 21100312323 its reverse (32321300112), we get a palindrome (53421612435).

The spelling of 21100312323 in words is "twenty-one billion, one hundred million, three hundred twelve thousand, three hundred twenty-three".