13231101221 has 4 divisors (see below), whose sum is σ = 14248878252. Its totient is φ = 12213324192.

The previous prime is 13231101167. The next prime is 13231101253. The reversal of 13231101221 is 12210113231.

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 2890245121 + 10340856100 = 53761^2 + 101690^2 .

It is a cyclic number.

It is not a de Polignac number, because 13231101221 - 2¹⁸ = 13230839077 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 13231101221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13231101721) 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, 508888496 + ... + 508888521.

It is an arithmetic number, because the mean of its divisors is an integer number (3562219563).

Almost surely, 2^13231101221 is an apocalyptic number.

It is an amenable number.

13231101221 is a deficient number, since it is larger than the sum of its proper divisors (1017777031).

13231101221 is a wasteful number, since it uses less digits than its factorization.

13231101221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1017777030.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 13231101221 its reverse (12210113231), we get a palindrome (25441214452).

The spelling of 13231101221 in words is "thirteen billion, two hundred thirty-one million, one hundred one thousand, two hundred twenty-one".