12223220 has 24 divisors (see below), whose sum is σ = 25736424. Its totient is φ = 4876416.

The previous prime is 12223199. The next prime is 12223271. The reversal of 12223220 is 2232221.

12223220 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 306916 + 11916304 = 554^2 + 3452^2 .

It is a junction number, because it is equal to n+sod(n) for n = 12223195 and 12223204.

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, 11762 + ... + 12758.

It is an arithmetic number, because the mean of its divisors is an integer number (1072351).

Almost surely, 2^12223220 is an apocalyptic number.

12223220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12223220 is an abundant number, since it is smaller than the sum of its proper divisors (13513204).

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

12223220 is a wasteful number, since it uses less digits than its factorization.

12223220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1619 (or 1617 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 14.

The square root of 12223220 is about 3496.1721925557. The cubic root of 12223220 is about 230.3537090723.

Adding to 12223220 its reverse (2232221), we get a palindrome (14455441).

Subtracting from 12223220 its reverse (2232221), we obtain a palindrome (9990999).

The spelling of 12223220 in words is "twelve million, two hundred twenty-three thousand, two hundred twenty".