13120204043021 has 4 divisors (see below), whose sum is σ = 13891980751452. Its totient is φ = 12348427334592.

The previous prime is 13120204042993. The next prime is 13120204043029. The reversal of 13120204043021 is 12034040202131.

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 8384296669225 + 4735907373796 = 2895565^2 + 2176214^2 .

It is a cyclic number.

It is not a de Polignac number, because 13120204043021 - 2¹⁸ = 13120203780877 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 (13120204043029) 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, 385888354190 + ... + 385888354223.

It is an arithmetic number, because the mean of its divisors is an integer number (3472995187863).

Almost surely, 2^{13120204043021} is an apocalyptic number.

It is an amenable number.

13120204043021 is a deficient number, since it is larger than the sum of its proper divisors (771776708431).

13120204043021 is an equidigital number, since it uses as much as digits as its factorization.

13120204043021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 771776708430.

The product of its (nonzero) digits is 1152, while the sum is 23.

Adding to 13120204043021 its reverse (12034040202131), we get a palindrome (25154244245152).

The spelling of 13120204043021 in words is "thirteen trillion, one hundred twenty billion, two hundred four million, forty-three thousand, twenty-one".