21342133213 has 4 divisors (see below), whose sum is σ = 21373658460. Its totient is φ = 21310607968.

The previous prime is 21342133199. The next prime is 21342133229. The reversal of 21342133213 is 31233124312.

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

It can be written as a sum of positive squares in 2 ways, for example, as 20700878884 + 641254329 = 143878^2 + 25323^2 .

It is a cyclic number.

It is not a de Polignac number, because 21342133213 - 2⁹ = 21342132701 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 (21342133243) 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, 15761608 + ... + 15762961.

It is an arithmetic number, because the mean of its divisors is an integer number (5343414615).

Almost surely, 2^21342133213 is an apocalyptic number.

It is an amenable number.

21342133213 is a deficient number, since it is larger than the sum of its proper divisors (31525247).

21342133213 is an equidigital number, since it uses as much as digits as its factorization.

21342133213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31525246.

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

Adding to 21342133213 its reverse (31233124312), we get a palindrome (52575257525).

The spelling of 21342133213 in words is "twenty-one billion, three hundred forty-two million, one hundred thirty-three thousand, two hundred thirteen".