12231211320 has 96 divisors (see below), whose sum is σ = 40296063600. Its totient is φ = 3216969216.

The previous prime is 12231211313. The next prime is 12231211327. The reversal of 12231211320 is 2311213221.

12231211320 is a `hidden beast` number, since 1 + 22 + 312 + 11 + 320 = 666.

It is an interprime number because it is at equal distance from previous prime (12231211313) and next prime (12231211327).

It is a super-2 number, since 2×12231211320² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 12231211293 and 12231211302.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12231211327) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 206430 + ... + 258989.

Almost surely, 2^12231211320 is an apocalyptic number.

12231211320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12231211320 is an abundant number, since it is smaller than the sum of its proper divisors (28064852280).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12231211320 is a wasteful number, since it uses less digits than its factorization.

12231211320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 465509 (or 465502 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 12231211320 its reverse (2311213221), we get a palindrome (14542424541).

The spelling of 12231211320 in words is "twelve billion, two hundred thirty-one million, two hundred eleven thousand, three hundred twenty".