12013021221 has 8 divisors (see below), whose sum is σ = 16018065600. Its totient is φ = 8008328832.

The previous prime is 12013021177. The next prime is 12013021243. The reversal of 12013021221 is 12212031021.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 12013021221 - 2²¹ = 12010924069 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12013021221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12013021261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5976 + ... + 155118.

It is an arithmetic number, because the mean of its divisors is an integer number (2002258200).

Almost surely, 2^12013021221 is an apocalyptic number.

It is an amenable number.

12013021221 is a deficient number, since it is larger than the sum of its proper divisors (4005044379).

12013021221 is a wasteful number, since it uses less digits than its factorization.

12013021221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 175995.

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

Adding to 12013021221 its reverse (12212031021), we get a palindrome (24225052242).

The spelling of 12013021221 in words is "twelve billion, thirteen million, twenty-one thousand, two hundred twenty-one".