12111301221 has 8 divisors (see below), whose sum is σ = 16149068160. Its totient is φ = 8073867552.

The previous prime is 12111301171. The next prime is 12111301253. The reversal of 12111301221 is 12210311121.

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

It is not a de Polignac number, because 12111301221 - 2¹⁵ = 12111268453 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12111301221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12111301261) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19665 + ... + 156873.

It is an arithmetic number, because the mean of its divisors is an integer number (2018633520).

Almost surely, 2^12111301221 is an apocalyptic number.

It is an amenable number.

12111301221 is a deficient number, since it is larger than the sum of its proper divisors (4037766939).

12111301221 is a wasteful number, since it uses less digits than its factorization.

12111301221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166635.

The product of its (nonzero) digits is 24, while the sum is 15.

Adding to 12111301221 its reverse (12210311121), we get a palindrome (24321612342).

The spelling of 12111301221 in words is "twelve billion, one hundred eleven million, three hundred one thousand, two hundred twenty-one".