35621221 has 2 divisors, whose sum is σ = 35621222. Its totient is φ = 35621220.

The previous prime is 35621203. The next prime is 35621279. The reversal of 35621221 is 12212653.

35621221 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., 34680321 + 940900 = 5889^2 + 970^2 .

It is a cyclic number.

It is not a de Polignac number, because 35621221 - 2⁵ = 35621189 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 35621192 and 35621201.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (35621321) 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, 17810610 + 17810611.

It is an arithmetic number, because the mean of its divisors is an integer number (17810611).

Almost surely, 2^35621221 is an apocalyptic number.

It is an amenable number.

35621221 is a deficient number, since it is larger than the sum of its proper divisors (1).

35621221 is an equidigital number, since it uses as much as digits as its factorization.

35621221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 720, while the sum is 22.

The square root of 35621221 is about 5968.3516149771. The cubic root of 35621221 is about 329.0305832257.

Adding to 35621221 its reverse (12212653), we get a palindrome (47833874).

The spelling of 35621221 in words is "thirty-five million, six hundred twenty-one thousand, two hundred twenty-one".