21320233020013 has 4 divisors (see below), whose sum is σ = 21473615991520. Its totient is φ = 21166850048508.

The previous prime is 21320233019963. The next prime is 21320233020041. The reversal of 21320233020013 is 31002033202312.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21320233020013 - 2²⁵ = 21320199465581 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 (21320233020113) 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, 76691485545 + ... + 76691485822.

It is an arithmetic number, because the mean of its divisors is an integer number (5368403997880).

Almost surely, 2^{21320233020013} is an apocalyptic number.

It is an amenable number.

21320233020013 is a deficient number, since it is larger than the sum of its proper divisors (153382971507).

21320233020013 is a wasteful number, since it uses less digits than its factorization.

21320233020013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 153382971506.

The product of its (nonzero) digits is 1296, while the sum is 22.

Adding to 21320233020013 its reverse (31002033202312), we get a palindrome (52322266222325).

The spelling of 21320233020013 in words is "twenty-one trillion, three hundred twenty billion, two hundred thirty-three million, twenty thousand, thirteen".