21301020233123 has 4 divisors (see below), whose sum is σ = 21796392796728. Its totient is φ = 20805647669520.

The previous prime is 21301020233093. The next prime is 21301020233147. The reversal of 21301020233123 is 32133202010312.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21301020233123 - 2¹⁰ = 21301020232099 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21301023233123) 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, 247686281738 + ... + 247686281823.

It is an arithmetic number, because the mean of its divisors is an integer number (5449098199182).

Almost surely, 2^{21301020233123} is an apocalyptic number.

21301020233123 is a deficient number, since it is larger than the sum of its proper divisors (495372563605).

21301020233123 is an equidigital number, since it uses as much as digits as its factorization.

21301020233123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 495372563604.

The product of its (nonzero) digits is 1296, while the sum is 23.

Adding to 21301020233123 its reverse (32133202010312), we get a palindrome (53434222243435).

The spelling of 21301020233123 in words is "twenty-one trillion, three hundred one billion, twenty million, two hundred thirty-three thousand, one hundred twenty-three".