12211021231 has 16 divisors (see below), whose sum is σ = 12613708800. Its totient is φ = 11815079328.

The previous prime is 12211021219. The next prime is 12211021247. The reversal of 12211021231 is 13212011221.

It is a cyclic number.

It is not a de Polignac number, because 12211021231 - 2³³ = 3621086639 is a prime.

It is a super-2 number, since 2×12211021231² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12211021531) 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, 6610350 + ... + 6612196.

It is an arithmetic number, because the mean of its divisors is an integer number (788356800).

Almost surely, 2^12211021231 is an apocalyptic number.

12211021231 is a deficient number, since it is larger than the sum of its proper divisors (402687569).

12211021231 is a wasteful number, since it uses less digits than its factorization.

12211021231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3558.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 12211021231 its reverse (13212011221), we get a palindrome (25423032452).

It can be divided in two parts, 122110 and 21231, that added together give a palindrome (143341).

The spelling of 12211021231 in words is "twelve billion, two hundred eleven million, twenty-one thousand, two hundred thirty-one".