21230232321013 has 4 divisors (see below), whose sum is σ = 21278156096448. Its totient is φ = 21182308545580.

The previous prime is 21230232320989. The next prime is 21230232321079. The reversal of 21230232321013 is 31012323203212.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21230232321013 - 2⁵ = 21230232320981 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 (21230232321083) 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, 23961887053 + ... + 23961887938.

It is an arithmetic number, because the mean of its divisors is an integer number (5319539024112).

Almost surely, 2^{21230232321013} is an apocalyptic number.

It is an amenable number.

21230232321013 is a deficient number, since it is larger than the sum of its proper divisors (47923775435).

21230232321013 is an equidigital number, since it uses as much as digits as its factorization.

21230232321013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47923775434.

The product of its (nonzero) digits is 2592, while the sum is 25.

Adding to 21230232321013 its reverse (31012323203212), we get a palindrome (52242555524225).

The spelling of 21230232321013 in words is "twenty-one trillion, two hundred thirty billion, two hundred thirty-two million, three hundred twenty-one thousand, thirteen".