21332333213 has 4 divisors (see below), whose sum is σ = 22067930940. Its totient is φ = 20596735488.

The previous prime is 21332333203. The next prime is 21332333221. The reversal of 21332333213 is 31233323312.

It is a happy number.

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 14782182724 + 6550150489 = 121582^2 + 80933^2 .

It is a cyclic number.

It is not a de Polignac number, because 21332333213 - 2²⁴ = 21315555997 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 (21332333203) 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, 367798820 + ... + 367798877.

It is an arithmetic number, because the mean of its divisors is an integer number (5516982735).

Almost surely, 2^21332333213 is an apocalyptic number.

It is an amenable number.

21332333213 is a deficient number, since it is larger than the sum of its proper divisors (735597727).

21332333213 is an equidigital number, since it uses as much as digits as its factorization.

21332333213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 735597726.

The product of its digits is 5832, while the sum is 26.

Adding to 21332333213 its reverse (31233323312), we get a palindrome (52565656525).

Subtracting 21332333213 from its reverse (31233323312), we obtain a palindrome (9900990099).

The spelling of 21332333213 in words is "twenty-one billion, three hundred thirty-two million, three hundred thirty-three thousand, two hundred thirteen".