12225243220 has 24 divisors (see below), whose sum is σ = 25694437608. Its totient is φ = 4886016000.

The previous prime is 12225243181. The next prime is 12225243227. The reversal of 12225243220 is 2234252221.

It can be written as a sum of positive squares in 4 ways, for example, as 314140176 + 11911103044 = 17724^2 + 109138^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12225243227) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 230461 + ... + 278500.

It is an arithmetic number, because the mean of its divisors is an integer number (1070601567).

Almost surely, 2^12225243220 is an apocalyptic number.

12225243220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12225243220 is an abundant number, since it is smaller than the sum of its proper divisors (13469194388).

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

12225243220 is a wasteful number, since it uses less digits than its factorization.

12225243220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 510171 (or 510169 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 25.

Adding to 12225243220 its reverse (2234252221), we get a palindrome (14459495441).

Subtracting from 12225243220 its reverse (2234252221), we obtain a palindrome (9990990999).

The spelling of 12225243220 in words is "twelve billion, two hundred twenty-five million, two hundred forty-three thousand, two hundred twenty".