13122220 has 24 divisors (see below), whose sum is σ = 27947808. Its totient is φ = 5174400.

The previous prime is 13122211. The next prime is 13122227. The reversal of 13122220 is 2222131.

It is a self number, because there is not a number n which added to its sum of digits gives 13122220.

It is not an unprimeable number, because it can be changed into a prime (13122227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3201 + ... + 6040.

It is an arithmetic number, because the mean of its divisors is an integer number (1164492).

Almost surely, 2^13122220 is an apocalyptic number.

13122220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13122220 is an abundant number, since it is smaller than the sum of its proper divisors (14825588).

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

13122220 is a wasteful number, since it uses less digits than its factorization.

13122220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9321 (or 9319 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 13122220 is about 3622.4604897776. The cubic root of 13122220 is about 235.8680436313.

Adding to 13122220 its reverse (2222131), we get a palindrome (15344351).

The spelling of 13122220 in words is "thirteen million, one hundred twenty-two thousand, two hundred twenty".