21110100123 has 32 divisors (see below), whose sum is σ = 34050931200. Its totient is φ = 11376078336.

The previous prime is 21110100083. The next prime is 21110100133. The reversal of 21110100123 is 32100101112.

It is not a de Polignac number, because 21110100123 - 2⁹ = 21110099611 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21110100099 and 21110100108.

It is not an unprimeable number, because it can be changed into a prime (21110100133) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 376878 + ... + 429251.

It is an arithmetic number, because the mean of its divisors is an integer number (1064091600).

Almost surely, 2^21110100123 is an apocalyptic number.

21110100123 is a deficient number, since it is larger than the sum of its proper divisors (12940831077).

21110100123 is a wasteful number, since it uses less digits than its factorization.

21110100123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 806211.

The product of its (nonzero) digits is 12, while the sum is 12.

Adding to 21110100123 its reverse (32100101112), we get a palindrome (53210201235).

The spelling of 21110100123 in words is "twenty-one billion, one hundred ten million, one hundred thousand, one hundred twenty-three".