21336313813 has 4 divisors (see below), whose sum is σ = 21479510700. Its totient is φ = 21193116928.

The previous prime is 21336313799. The next prime is 21336313841. The reversal of 21336313813 is 31831363312.

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 1443468049 + 19892845764 = 37993^2 + 141042^2 .

It is a cyclic number.

It is not a de Polignac number, because 21336313813 - 2¹³ = 21336305621 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 (21336343813) 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, 71598220 + ... + 71598517.

It is an arithmetic number, because the mean of its divisors is an integer number (5369877675).

Almost surely, 2^21336313813 is an apocalyptic number.

It is an amenable number.

21336313813 is a deficient number, since it is larger than the sum of its proper divisors (143196887).

21336313813 is a wasteful number, since it uses less digits than its factorization.

21336313813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143196886.

The product of its digits is 23328, while the sum is 34.

It can be divided in two parts, 2133631 and 3813, that added together give a square (2137444 = 1462²).

The spelling of 21336313813 in words is "twenty-one billion, three hundred thirty-six million, three hundred thirteen thousand, eight hundred thirteen".