21002320133213 has 4 divisors (see below), whose sum is σ = 21010016112540. Its totient is φ = 20994624153888.

The previous prime is 21002320133177. The next prime is 21002320133251. The reversal of 21002320133213 is 31233102320012.

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 16392311782564 + 4610008350649 = 4048742^2 + 2147093^2 .

It is a cyclic number.

It is not a de Polignac number, because 21002320133213 - 2¹² = 21002320129117 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 (21002320138213) 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, 3847985570 + ... + 3847991027.

It is an arithmetic number, because the mean of its divisors is an integer number (5252504028135).

Almost surely, 2^{21002320133213} is an apocalyptic number.

It is an amenable number.

21002320133213 is a deficient number, since it is larger than the sum of its proper divisors (7695979327).

21002320133213 is an equidigital number, since it uses as much as digits as its factorization.

21002320133213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7695979326.

The product of its (nonzero) digits is 1296, while the sum is 23.

Adding to 21002320133213 its reverse (31233102320012), we get a palindrome (52235422453225).

The spelling of 21002320133213 in words is "twenty-one trillion, two billion, three hundred twenty million, one hundred thirty-three thousand, two hundred thirteen".