13211812 has 12 divisors (see below), whose sum is σ = 23745820. Its totient is φ = 6427296.

The previous prime is 13211801. The next prime is 13211813. The reversal of 13211812 is 21811231.

It can be written as a sum of positive squares in 2 ways, for example, as 8433216 + 4778596 = 2904^2 + 2186^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 13211812.

It is not an unprimeable number, because it can be changed into a prime (13211813) 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, 44487 + ... + 44782.

Almost surely, 2^13211812 is an apocalyptic number.

It is an amenable number.

13211812 is a deficient number, since it is larger than the sum of its proper divisors (10534008).

13211812 is a wasteful number, since it uses less digits than its factorization.

13211812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89310 (or 89308 counting only the distinct ones).

The product of its digits is 96, while the sum is 19.

The square root of 13211812 is about 3634.8056344184. The cubic root of 13211812 is about 236.4036231972.

The spelling of 13211812 in words is "thirteen million, two hundred eleven thousand, eight hundred twelve".