13021836 has 12 divisors (see below), whose sum is σ = 30384312. Its totient is φ = 4340608.

The previous prime is 13021823. The next prime is 13021843. The reversal of 13021836 is 63812031.

It is a tau number, because it is divible by the number of its divisors (12).

It is an unprimeable number.

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, 542565 + ... + 542588.

It is an arithmetic number, because the mean of its divisors is an integer number (2532026).

Almost surely, 2^13021836 is an apocalyptic number.

It is an amenable number.

13021836 is an abundant number, since it is smaller than the sum of its proper divisors (17362476).

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

13021836 is a wasteful number, since it uses less digits than its factorization.

13021836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1085160 (or 1085158 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 13021836 is about 3608.5781133294. The cubic root of 13021836 is about 235.2650457562.

Adding to 13021836 its reverse (63812031), we get a palindrome (76833867).

The spelling of 13021836 in words is "thirteen million, twenty-one thousand, eight hundred thirty-six".