13632821 has 2 divisors, whose sum is σ = 13632822. Its totient is φ = 13632820.

The previous prime is 13632791. The next prime is 13632841. The reversal of 13632821 is 12823631.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13586596 + 46225 = 3686^2 + 215^2 .

It is a cyclic number.

It is not a de Polignac number, because 13632821 - 2⁶ = 13632757 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13632841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6816410 + 6816411.

It is an arithmetic number, because the mean of its divisors is an integer number (6816411).

Almost surely, 2^13632821 is an apocalyptic number.

It is an amenable number.

13632821 is a deficient number, since it is larger than the sum of its proper divisors (1).

13632821 is an equidigital number, since it uses as much as digits as its factorization.

13632821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1728, while the sum is 26.

The square root of 13632821 is about 3692.2650229906. The cubic root of 13632821 is about 238.8885003619. Note that the first 3 decimals are identical.

The spelling of 13632821 in words is "thirteen million, six hundred thirty-two thousand, eight hundred twenty-one".