21330013213 has 8 divisors (see below), whose sum is σ = 22331383200. Its totient is φ = 20346366768.

The previous prime is 21330013189. The next prime is 21330013223. The reversal of 21330013213 is 31231003312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21330013213 - 2⁵ = 21330013181 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 (21330013223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4428423 + ... + 4433236.

It is an arithmetic number, because the mean of its divisors is an integer number (2791422900).

Almost surely, 2^21330013213 is an apocalyptic number.

It is an amenable number.

21330013213 is a deficient number, since it is larger than the sum of its proper divisors (1001369987).

21330013213 is an equidigital number, since it uses as much as digits as its factorization.

21330013213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8861771.

The product of its (nonzero) digits is 324, while the sum is 19.

Adding to 21330013213 its reverse (31231003312), we get a palindrome (52561016525).

Subtracting 21330013213 from its reverse (31231003312), we obtain a palindrome (9900990099).

The spelling of 21330013213 in words is "twenty-one billion, three hundred thirty million, thirteen thousand, two hundred thirteen".