33550064221 has 2 divisors, whose sum is σ = 33550064222. Its totient is φ = 33550064220.

The previous prime is 33550064159. The next prime is 33550064231. The reversal of 33550064221 is 12246005533.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21926205625 + 11623858596 = 148075^2 + 107814^2 .

It is a cyclic number.

It is not a de Polignac number, because 33550064221 - 2²⁹ = 33013193309 is a prime.

It is a super-2 number, since 2×33550064221² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (33550064231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16775032110 + 16775032111.

It is an arithmetic number, because the mean of its divisors is an integer number (16775032111).

Almost surely, 2^33550064221 is an apocalyptic number.

It is an amenable number.

33550064221 is a deficient number, since it is larger than the sum of its proper divisors (1).

33550064221 is an equidigital number, since it uses as much as digits as its factorization.

33550064221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 21600, while the sum is 31.

Adding to 33550064221 its reverse (12246005533), we get a palindrome (45796069754).

The spelling of 33550064221 in words is "thirty-three billion, five hundred fifty million, sixty-four thousand, two hundred twenty-one".