21002103310123 has 8 divisors (see below), whose sum is σ = 23044397827248. Its totient is φ = 19020772808544.

The previous prime is 21002103310021. The next prime is 21002103310163. The reversal of 21002103310123 is 32101330120012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21002103310123 - 2²⁵ = 21002069755691 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 21002103310123.

It is not an unprimeable number, because it can be changed into a prime (21002103310163) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15241003165 + ... + 15241004542.

It is an arithmetic number, because the mean of its divisors is an integer number (2880549728406).

Almost surely, 2^{21002103310123} is an apocalyptic number.

21002103310123 is a deficient number, since it is larger than the sum of its proper divisors (2042294517125).

21002103310123 is a wasteful number, since it uses less digits than its factorization.

21002103310123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30482007773.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 21002103310123 its reverse (32101330120012), we get a palindrome (53103433430135).

The spelling of 21002103310123 in words is "twenty-one trillion, two billion, one hundred three million, three hundred ten thousand, one hundred twenty-three".