12211232231 has 4 divisors (see below), whose sum is σ = 13321344264. Its totient is φ = 11101120200.

The previous prime is 12211232221. The next prime is 12211232233. The reversal of 12211232231 is 13223211221.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 12211232231 - 2⁶ = 12211232167 is a prime.

It is a super-2 number, since 2×12211232231² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12211232233) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 555056000 + ... + 555056021.

It is an arithmetic number, because the mean of its divisors is an integer number (3330336066).

Almost surely, 2^12211232231 is an apocalyptic number.

12211232231 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

12211232231 is a deficient number, since it is larger than the sum of its proper divisors (1110112033).

12211232231 is a wasteful number, since it uses less digits than its factorization.

12211232231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1110112032.

The product of its digits is 288, while the sum is 20.

Adding to 12211232231 its reverse (13223211221), we get a palindrome (25434443452).

It can be divided in two parts, 12211 and 232231, that added together give a palindrome (244442).

The spelling of 12211232231 in words is "twelve billion, two hundred eleven million, two hundred thirty-two thousand, two hundred thirty-one".