33500223221 has 2 divisors, whose sum is σ = 33500223222. Its totient is φ = 33500223220.

The previous prime is 33500223209. The next prime is 33500223223. The reversal of 33500223221 is 12232200533.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21899856196 + 11600367025 = 147986^2 + 107705^2 .

It is a cyclic number.

It is not a de Polignac number, because 33500223221 - 2¹⁴ = 33500206837 is a prime.

It is a super-2 number, since 2×33500223221² (a number of 22 digits) contains 22 as substring.

Together with 33500223223, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (33500223223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16750111610 + 16750111611.

It is an arithmetic number, because the mean of its divisors is an integer number (16750111611).

Almost surely, 2^33500223221 is an apocalyptic number.

It is an amenable number.

33500223221 is a deficient number, since it is larger than the sum of its proper divisors (1).

33500223221 is an equidigital number, since it uses as much as digits as its factorization.

33500223221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2160, while the sum is 23.

Adding to 33500223221 its reverse (12232200533), we get a palindrome (45732423754).

The spelling of 33500223221 in words is "thirty-three billion, five hundred million, two hundred twenty-three thousand, two hundred twenty-one".