13155530021 has 4 divisors (see below), whose sum is σ = 13167589344. Its totient is φ = 13143470700.

The previous prime is 13155529993. The next prime is 13155530051. The reversal of 13155530021 is 12003555131.

It is a happy number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 12003555131 = 109 ⋅110124359.

It is a cyclic number.

It is not a de Polignac number, because 13155530021 - 2⁶ = 13155529957 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 (13155530051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6028025 + ... + 6030206.

It is an arithmetic number, because the mean of its divisors is an integer number (3291897336).

Almost surely, 2^13155530021 is an apocalyptic number.

It is an amenable number.

13155530021 is a deficient number, since it is larger than the sum of its proper divisors (12059323).

13155530021 is a wasteful number, since it uses less digits than its factorization.

13155530021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12059322.

The product of its (nonzero) digits is 2250, while the sum is 26.

The spelling of 13155530021 in words is "thirteen billion, one hundred fifty-five million, five hundred thirty thousand, twenty-one".