12222211021221 has 16 divisors (see below), whose sum is σ = 16415707434048. Its totient is φ = 8088431088000.

The previous prime is 12222211021219. The next prime is 12222211021231. The reversal of 12222211021221 is 12212011222221.

It is not a de Polignac number, because 12222211021221 - 2¹ = 12222211021219 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12222211021231) 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, 14408746 + ... + 15233396.

It is an arithmetic number, because the mean of its divisors is an integer number (1025981714628).

Almost surely, 2^{12222211021221} is an apocalyptic number.

It is an amenable number.

12222211021221 is a deficient number, since it is larger than the sum of its proper divisors (4193496412827).

12222211021221 is a wasteful number, since it uses less digits than its factorization.

12222211021221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 860852.

The product of its (nonzero) digits is 256, while the sum is 21.

Adding to 12222211021221 its reverse (12212011222221), we get a palindrome (24434222243442).

The spelling of 12222211021221 in words is "twelve trillion, two hundred twenty-two billion, two hundred eleven million, twenty-one thousand, two hundred twenty-one".