12212123231 has 16 divisors (see below), whose sum is σ = 15360254208. Its totient is φ = 9431721600.

The previous prime is 12212123197. The next prime is 12212123279. The reversal of 12212123231 is 13232121221.

It is not a de Polignac number, because 12212123231 - 2¹⁴ = 12212106847 is a prime.

It is a super-2 number, since 2×12212123231² (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 (12212123731) 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, 693065 + ... + 710466.

It is an arithmetic number, because the mean of its divisors is an integer number (960015888).

Almost surely, 2^12212123231 is an apocalyptic number.

12212123231 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

12212123231 is a deficient number, since it is larger than the sum of its proper divisors (3148130977).

12212123231 is a wasteful number, since it uses less digits than its factorization.

12212123231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1403662.

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

Adding to 12212123231 its reverse (13232121221), we get a palindrome (25444244452).

The spelling of 12212123231 in words is "twelve billion, two hundred twelve million, one hundred twenty-three thousand, two hundred thirty-one".