13366821 has 16 divisors (see below), whose sum is σ = 19414080. Its totient is φ = 8131200.

The previous prime is 13366819. The next prime is 13366831. The reversal of 13366821 is 12866331.

It is not a de Polignac number, because 13366821 - 2¹ = 13366819 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13366831) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1546 + ... + 5396.

It is an arithmetic number, because the mean of its divisors is an integer number (1213380).

Almost surely, 2^13366821 is an apocalyptic number.

It is an amenable number.

13366821 is a deficient number, since it is larger than the sum of its proper divisors (6047259).

13366821 is a wasteful number, since it uses less digits than its factorization.

13366821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3956.

The product of its digits is 5184, while the sum is 30.

The square root of 13366821 is about 3656.0663287200. The cubic root of 13366821 is about 237.3245744271.

The spelling of 13366821 in words is "thirteen million, three hundred sixty-six thousand, eight hundred twenty-one".