21333013213 has 4 divisors (see below), whose sum is σ = 21333307068. Its totient is φ = 21332719360.

The previous prime is 21333013201. The next prime is 21333013217. The reversal of 21333013213 is 31231033312.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 18138163684 + 3194849529 = 134678^2 + 56523^2 .

It is a cyclic number.

It is not a de Polignac number, because 21333013213 - 2¹⁷ = 21332882141 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 (21333013217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 49533 + ... + 212413.

It is an arithmetic number, because the mean of its divisors is an integer number (5333326767).

Almost surely, 2^21333013213 is an apocalyptic number.

It is an amenable number.

21333013213 is a deficient number, since it is larger than the sum of its proper divisors (293855).

21333013213 is a wasteful number, since it uses less digits than its factorization.

21333013213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 293854.

The product of its (nonzero) digits is 972, while the sum is 22.

Adding to 21333013213 its reverse (31231033312), we get a palindrome (52564046525).

The spelling of 21333013213 in words is "twenty-one billion, three hundred thirty-three million, thirteen thousand, two hundred thirteen".