13031231010221 has 4 divisors (see below), whose sum is σ = 13153018216032. Its totient is φ = 12909443804412.

The previous prime is 13031231010191. The next prime is 13031231010263. The reversal of 13031231010221 is 12201013213031.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13031231010221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13031231010193 and 13031231010202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13031231012221) 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, 60893602745 + ... + 60893602958.

It is an arithmetic number, because the mean of its divisors is an integer number (3288254554008).

Almost surely, 2^{13031231010221} is an apocalyptic number.

It is an amenable number.

13031231010221 is a deficient number, since it is larger than the sum of its proper divisors (121787205811).

13031231010221 is a wasteful number, since it uses less digits than its factorization.

13031231010221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121787205810.

The product of its (nonzero) digits is 216, while the sum is 20.

Adding to 13031231010221 its reverse (12201013213031), we get a palindrome (25232244223252).

The spelling of 13031231010221 in words is "thirteen trillion, thirty-one billion, two hundred thirty-one million, ten thousand, two hundred twenty-one".