13222420 has 12 divisors (see below), whose sum is σ = 27767124. Its totient is φ = 5288960.

The previous prime is 13222411. The next prime is 13222427. The reversal of 13222420 is 2422231.

It can be written as a sum of positive squares in 2 ways, for example, as 6061444 + 7160976 = 2462^2 + 2676^2 .

It is a junction number, because it is equal to n+sod(n) for n = 13222394 and 13222403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13222427) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 330541 + ... + 330580.

It is an arithmetic number, because the mean of its divisors is an integer number (2313927).

Almost surely, 2^13222420 is an apocalyptic number.

13222420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13222420 is an abundant number, since it is smaller than the sum of its proper divisors (14544704).

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

13222420 is a wasteful number, since it uses less digits than its factorization.

13222420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 661130 (or 661128 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 16.

The square root of 13222420 is about 3636.2645668323. The cubic root of 13222420 is about 236.4668771691.

Adding to 13222420 its reverse (2422231), we get a palindrome (15644651).

The spelling of 13222420 in words is "thirteen million, two hundred twenty-two thousand, four hundred twenty".