13145033021 has 4 divisors (see below), whose sum is σ = 13147160412. Its totient is φ = 13142905632.

The previous prime is 13145033009. The next prime is 13145033059. The reversal of 13145033021 is 12033054131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12033054131 = 7 ⋅1719007733.

It can be written as a sum of positive squares in 2 ways, for example, as 7764076996 + 5380956025 = 88114^2 + 73355^2 .

It is a cyclic number.

It is not a de Polignac number, because 13145033021 - 2¹⁰ = 13145031997 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 (13145033521) 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, 1054400 + ... + 1066793.

It is an arithmetic number, because the mean of its divisors is an integer number (3286790103).

Almost surely, 2^13145033021 is an apocalyptic number.

It is an amenable number.

13145033021 is a deficient number, since it is larger than the sum of its proper divisors (2127391).

13145033021 is an equidigital number, since it uses as much as digits as its factorization.

13145033021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2127390.

The product of its (nonzero) digits is 1080, while the sum is 23.

Adding to 13145033021 its reverse (12033054131), we get a palindrome (25178087152).

The spelling of 13145033021 in words is "thirteen billion, one hundred forty-five million, thirty-three thousand, twenty-one".