13003131021 has 4 divisors (see below), whose sum is σ = 17337508032. Its totient is φ = 8668754012.

The previous prime is 13003131019. The next prime is 13003131077. The reversal of 13003131021 is 12013130031.

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 13003131021 - 2¹ = 13003131019 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13003131221) 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, 2167188501 + ... + 2167188506.

It is an arithmetic number, because the mean of its divisors is an integer number (4334377008).

Almost surely, 2^13003131021 is an apocalyptic number.

It is an amenable number.

13003131021 is a deficient number, since it is larger than the sum of its proper divisors (4334377011).

13003131021 is an equidigital number, since it uses as much as digits as its factorization.

13003131021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4334377010.

The product of its (nonzero) digits is 54, while the sum is 15.

Adding to 13003131021 its reverse (12013130031), we get a palindrome (25016261052).

The spelling of 13003131021 in words is "thirteen billion, three million, one hundred thirty-one thousand, twenty-one".