21100332123 has 24 divisors (see below), whose sum is σ = 32840458560. Its totient is φ = 12977809920.

The previous prime is 21100332101. The next prime is 21100332199. The reversal of 21100332123 is 32123300112.

21100332123 is a `hidden beast` number, since 211 + 0 + 0 + 332 + 123 = 666.

It is not a de Polignac number, because 21100332123 - 2⁵ = 21100332091 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21100332096 and 21100332105.

It is not an unprimeable number, because it can be changed into a prime (21100332223) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 173278 + ... + 268748.

It is an arithmetic number, because the mean of its divisors is an integer number (1368352440).

Almost surely, 2^21100332123 is an apocalyptic number.

21100332123 is a deficient number, since it is larger than the sum of its proper divisors (11740126437).

21100332123 is a wasteful number, since it uses less digits than its factorization.

21100332123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97379 (or 97376 counting only the distinct ones).

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

Adding to 21100332123 its reverse (32123300112), we get a palindrome (53223632235).

The spelling of 21100332123 in words is "twenty-one billion, one hundred million, three hundred thirty-two thousand, one hundred twenty-three".