13213444 has 12 divisors (see below), whose sum is σ = 23921100. Its totient is φ = 6378848.

The previous prime is 13213441. The next prime is 13213451. The reversal of 13213444 is 44431231.

It can be written as a sum of positive squares in 2 ways, for example, as 2402500 + 10810944 = 1550^2 + 3288^2 .

It is a super-2 number, since 2×13213444² = 349190204682272, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (13213441) 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 3 ways as a sum of consecutive naturals, for example, 56839 + ... + 57070.

It is an arithmetic number, because the mean of its divisors is an integer number (1993425).

Almost surely, 2^13213444 is an apocalyptic number.

It is an amenable number.

13213444 is a deficient number, since it is larger than the sum of its proper divisors (10707656).

13213444 is a wasteful number, since it uses less digits than its factorization.

13213444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113942 (or 113940 counting only the distinct ones).

The product of its digits is 1152, while the sum is 22.

The square root of 13213444 is about 3635.0301236716. The cubic root of 13213444 is about 236.4133567807.

Adding to 13213444 its reverse (44431231), we get a palindrome (57644675).

It can be divided in two parts, 13 and 213444, that multiplied together give a palindrome (2774772).

The spelling of 13213444 in words is "thirteen million, two hundred thirteen thousand, four hundred forty-four".