13203340021 has 4 divisors (see below), whose sum is σ = 13320183852. Its totient is φ = 13086496192.

The previous prime is 13203340013. The next prime is 13203340067. The reversal of 13203340021 is 12004330231.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12004330231 = 5861 ⋅2048171.

It can be written as a sum of positive squares in 2 ways, for example, as 6338388996 + 6864951025 = 79614^2 + 82855^2 .

It is a cyclic number.

It is not a de Polignac number, because 13203340021 - 2³ = 13203340013 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 (13203340621) 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, 58421746 + ... + 58421971.

It is an arithmetic number, because the mean of its divisors is an integer number (3330045963).

Almost surely, 2^13203340021 is an apocalyptic number.

It is an amenable number.

13203340021 is a deficient number, since it is larger than the sum of its proper divisors (116843831).

13203340021 is a wasteful number, since it uses less digits than its factorization.

13203340021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116843830.

The product of its (nonzero) digits is 432, while the sum is 19.

Adding to 13203340021 its reverse (12004330231), we get a palindrome (25207670252).

The spelling of 13203340021 in words is "thirteen billion, two hundred three million, three hundred forty thousand, twenty-one".