13221210021 has 32 divisors (see below), whose sum is σ = 18805194240. Its totient is φ = 8238417984.

The previous prime is 13221210019. The next prime is 13221210049. The reversal of 13221210021 is 12001212231.

It is not a de Polignac number, because 13221210021 - 2¹ = 13221210019 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13221210011) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4715406 + ... + 4718208.

It is an arithmetic number, because the mean of its divisors is an integer number (587662320).

Almost surely, 2^13221210021 is an apocalyptic number.

It is an amenable number.

13221210021 is a deficient number, since it is larger than the sum of its proper divisors (5583984219).

13221210021 is a wasteful number, since it uses less digits than its factorization.

13221210021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3905.

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 13221210021 its reverse (12001212231), we get a palindrome (25222422252).

The spelling of 13221210021 in words is "thirteen billion, two hundred twenty-one million, two hundred ten thousand, twenty-one".