13231033221 has 16 divisors (see below), whose sum is σ = 20630449664. Its totient is φ = 7384762224.

The previous prime is 13231033219. The next prime is 13231033279. The reversal of 13231033221 is 12233013231.

It is not a de Polignac number, because 13231033221 - 2¹ = 13231033219 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13231035221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7325251 + ... + 7327056.

It is an arithmetic number, because the mean of its divisors is an integer number (1289403104).

Almost surely, 2^13231033221 is an apocalyptic number.

It is an amenable number.

13231033221 is a deficient number, since it is larger than the sum of its proper divisors (7399416443).

13231033221 is a wasteful number, since it uses less digits than its factorization.

13231033221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14652360.

The product of its (nonzero) digits is 648, while the sum is 21.

Adding to 13231033221 its reverse (12233013231), we get a palindrome (25464046452).

The spelling of 13231033221 in words is "thirteen billion, two hundred thirty-one million, thirty-three thousand, two hundred twenty-one".