21001323231103 has 16 divisors (see below), whose sum is σ = 22825454515200. Its totient is φ = 19249391327040.

The previous prime is 21001323231071. The next prime is 21001323231139. The reversal of 21001323231103 is 30113232310012.

It is a cyclic number.

It is not a de Polignac number, because 21001323231103 - 2⁵ = 21001323231071 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21001323234103) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2068726 + ... + 6803107.

It is an arithmetic number, because the mean of its divisors is an integer number (1426590907200).

Almost surely, 2^{21001323231103} is an apocalyptic number.

21001323231103 is a deficient number, since it is larger than the sum of its proper divisors (1824131284097).

21001323231103 is a wasteful number, since it uses less digits than its factorization.

21001323231103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8875902.

The product of its (nonzero) digits is 648, while the sum is 22.

Adding to 21001323231103 its reverse (30113232310012), we get a palindrome (51114555541115).

The spelling of 21001323231103 in words is "twenty-one trillion, one billion, three hundred twenty-three million, two hundred thirty-one thousand, one hundred three".