33101221 has 2 divisors, whose sum is σ = 33101222. Its totient is φ = 33101220.

The previous prime is 33101219. The next prime is 33101239. The reversal of 33101221 is 12210133.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17969121 + 15132100 = 4239^2 + 3890^2 .

It is a cyclic number.

It is not a de Polignac number, because 33101221 - 2¹ = 33101219 is a prime.

Together with 33101219, 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 (33101251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16550610 + 16550611.

It is an arithmetic number, because the mean of its divisors is an integer number (16550611).

Almost surely, 2^33101221 is an apocalyptic number.

It is an amenable number.

33101221 is a deficient number, since it is larger than the sum of its proper divisors (1).

33101221 is an equidigital number, since it uses as much as digits as its factorization.

33101221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36, while the sum is 13.

The square root of 33101221 is about 5753.3660582306. The cubic root of 33101221 is about 321.0810475888.

Adding to 33101221 its reverse (12210133), we get a palindrome (45311354).

The spelling of 33101221 in words is "thirty-three million, one hundred one thousand, two hundred twenty-one".