13031231011021 has 4 divisors (see below), whose sum is σ = 13126349485692. Its totient is φ = 12936112536352.

The previous prime is 13031231011009. The next prime is 13031231011091. The reversal of 13031231011021 is 12011013213031.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 11006270704900 + 2024960306121 = 3317570^2 + 1423011^2 .

It is a cyclic number.

It is not a de Polignac number, because 13031231011021 - 2⁵ = 13031231010989 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 13031231011021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13031231011091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 47559237130 + ... + 47559237403.

It is an arithmetic number, because the mean of its divisors is an integer number (3281587371423).

Almost surely, 2^{13031231011021} is an apocalyptic number.

It is an amenable number.

13031231011021 is a deficient number, since it is larger than the sum of its proper divisors (95118474671).

13031231011021 is an equidigital number, since it uses as much as digits as its factorization.

13031231011021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95118474670.

The product of its (nonzero) digits is 108, while the sum is 19.

Adding to 13031231011021 its reverse (12011013213031), we get a palindrome (25042244224052).

The spelling of 13031231011021 in words is "thirteen trillion, thirty-one billion, two hundred thirty-one million, eleven thousand, twenty-one".