21232023313 has 4 divisors (see below), whose sum is σ = 21232454068. Its totient is φ = 21231592560.

The previous prime is 21232023283. The next prime is 21232023343. The reversal of 21232023313 is 31332023212.

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

It is an interprime number because it is at equal distance from previous prime (21232023283) and next prime (21232023343).

It can be written as a sum of positive squares in 2 ways, for example, as 7982171649 + 13249851664 = 89343^2 + 115108^2 .

It is a cyclic number.

It is not a de Polignac number, because 21232023313 - 2¹³ = 21232015121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21232023343) 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, 130218 + ... + 243763.

It is an arithmetic number, because the mean of its divisors is an integer number (5308113517).

Almost surely, 2^21232023313 is an apocalyptic number.

It is an amenable number.

21232023313 is a deficient number, since it is larger than the sum of its proper divisors (430755).

21232023313 is an equidigital number, since it uses as much as digits as its factorization.

21232023313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 430754.

The product of its (nonzero) digits is 1296, while the sum is 22.

Adding to 21232023313 its reverse (31332023212), we get a palindrome (52564046525).

The spelling of 21232023313 in words is "twenty-one billion, two hundred thirty-two million, twenty-three thousand, three hundred thirteen".