13031124221 has 4 divisors (see below), whose sum is σ = 13032193500. Its totient is φ = 13030054944.

The previous prime is 13031124143. The next prime is 13031124287. The reversal of 13031124221 is 12242113031.

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 2092056121 + 10939068100 = 45739^2 + 104590^2 .

It is a cyclic number.

It is not a de Polignac number, because 13031124221 - 2¹⁸ = 13030862077 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13031124193 and 13031124202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13031123221) 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 3 ways as a sum of consecutive naturals, for example, 516146 + ... + 540803.

It is an arithmetic number, because the mean of its divisors is an integer number (3258048375).

Almost surely, 2^13031124221 is an apocalyptic number.

It is an amenable number.

13031124221 is a deficient number, since it is larger than the sum of its proper divisors (1069279).

13031124221 is a wasteful number, since it uses less digits than its factorization.

13031124221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1069278.

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 13031124221 its reverse (12242113031), we get a palindrome (25273237252).

The spelling of 13031124221 in words is "thirteen billion, thirty-one million, one hundred twenty-four thousand, two hundred twenty-one".