21210103103123 has 32 divisors (see below), whose sum is σ = 23794023359232. Its totient is φ = 18745264944000.

The previous prime is 21210103103017. The next prime is 21210103103131. The reversal of 21210103103123 is 32130130101212.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21210103103123 - 2³⁴ = 21192923233939 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21210103103095 and 21210103103104.

It is not an unprimeable number, because it can be changed into a prime (21210103003123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 14325161 + ... + 15736277.

It is an arithmetic number, because the mean of its divisors is an integer number (743563229976).

Almost surely, 2^{21210103103123} is an apocalyptic number.

21210103103123 is a deficient number, since it is larger than the sum of its proper divisors (2583920256109).

21210103103123 is a wasteful number, since it uses less digits than its factorization.

21210103103123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1411475.

The product of its (nonzero) digits is 216, while the sum is 20.

Adding to 21210103103123 its reverse (32130130101212), we get a palindrome (53340233204335).

The spelling of 21210103103123 in words is "twenty-one trillion, two hundred ten billion, one hundred three million, one hundred three thousand, one hundred twenty-three".