36641221 has 2 divisors, whose sum is σ = 36641222. Its totient is φ = 36641220.

The previous prime is 36641219. The next prime is 36641233. The reversal of 36641221 is 12214663.

36641221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 33350625 + 3290596 = 5775^2 + 1814^2 .

It is a cyclic number.

It is not a de Polignac number, because 36641221 - 2¹ = 36641219 is a prime.

Together with 36641219, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (36641201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18320610 + 18320611.

It is an arithmetic number, because the mean of its divisors is an integer number (18320611).

Almost surely, 2^36641221 is an apocalyptic number.

It is an amenable number.

36641221 is a deficient number, since it is larger than the sum of its proper divisors (1).

36641221 is an equidigital number, since it uses as much as digits as its factorization.

36641221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1728, while the sum is 25.

The square root of 36641221 is about 6053.1992367673. The cubic root of 36641221 is about 332.1416298277.

Adding to 36641221 its reverse (12214663), we get a palindrome (48855884).

It can be divided in two parts, 3664 and 1221, that multiplied together give a palindrome (4473744).

The spelling of 36641221 in words is "thirty-six million, six hundred forty-one thousand, two hundred twenty-one".