13131201421 has 32 divisors (see below), whose sum is σ = 15664168800. Its totient is φ = 10890485760.

The previous prime is 13131201407. The next prime is 13131201437. The reversal of 13131201421 is 12410213131.

It can be written as a sum of positive squares in 16 ways, for example, as 6808725225 + 6322476196 = 82515^2 + 79514^2 .

It is a cyclic number.

It is not a de Polignac number, because 13131201421 - 2⁵ = 13131201389 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 (13131201221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 558891 + ... + 581911.

It is an arithmetic number, because the mean of its divisors is an integer number (489505275).

Almost surely, 2^13131201421 is an apocalyptic number.

It is an amenable number.

13131201421 is a deficient number, since it is larger than the sum of its proper divisors (2532967379).

13131201421 is a wasteful number, since it uses less digits than its factorization.

13131201421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23169.

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 13131201421 its reverse (12410213131), we get a palindrome (25541414552).

The spelling of 13131201421 in words is "thirteen billion, one hundred thirty-one million, two hundred one thousand, four hundred twenty-one".