21303010300123 has 4 divisors (see below), whose sum is σ = 21303021194208. Its totient is φ = 21302999406040.

The previous prime is 21303010300097. The next prime is 21303010300163. The reversal of 21303010300123 is 32100301030312.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21303010300123 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 21303010300123.

It is not an unprimeable number, because it can be changed into a prime (21303010300163) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1615411 + ... + 6724252.

It is an arithmetic number, because the mean of its divisors is an integer number (5325755298552).

Almost surely, 2^{21303010300123} is an apocalyptic number.

21303010300123 is a deficient number, since it is larger than the sum of its proper divisors (10894085).

21303010300123 is an equidigital number, since it uses as much as digits as its factorization.

21303010300123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10894084.

The product of its (nonzero) digits is 324, while the sum is 19.

Adding to 21303010300123 its reverse (32100301030312), we get a palindrome (53403311330435).

The spelling of 21303010300123 in words is "twenty-one trillion, three hundred three billion, ten million, three hundred thousand, one hundred twenty-three".