12311220 has 24 divisors (see below), whose sum is σ = 34471584. Its totient is φ = 3282976.

The previous prime is 12311219. The next prime is 12311251. The reversal of 12311220 is 2211321.

It is a super-2 number, since 2×12311220² = 303132275776800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 12311196 and 12311205.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 102534 + ... + 102653.

It is an arithmetic number, because the mean of its divisors is an integer number (1436316).

Almost surely, 2^12311220 is an apocalyptic number.

12311220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12311220 is an abundant number, since it is smaller than the sum of its proper divisors (22160364).

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

12311220 is a wasteful number, since it uses less digits than its factorization.

12311220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 205199 (or 205197 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 12.

The square root of 12311220 is about 3508.7348147160. The cubic root of 12311220 is about 230.9051915051.

Adding to 12311220 its reverse (2211321), we get a palindrome (14522541).

The spelling of 12311220 in words is "twelve million, three hundred eleven thousand, two hundred twenty".