33105144404221 has 2 divisors, whose sum is σ = 33105144404222. Its totient is φ = 33105144404220.

The previous prime is 33105144404207. The next prime is 33105144404249. The reversal of 33105144404221 is 12240444150133.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19551775784121 + 13553368620100 = 4421739^2 + 3681490^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-33105144404221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (33105144404281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16552572202110 + 16552572202111.

It is an arithmetic number, because the mean of its divisors is an integer number (16552572202111).

Almost surely, 2^{33105144404221} is an apocalyptic number.

It is an amenable number.

33105144404221 is a deficient number, since it is larger than the sum of its proper divisors (1).

33105144404221 is an equidigital number, since it uses as much as digits as its factorization.

33105144404221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 46080, while the sum is 34.

Adding to 33105144404221 its reverse (12240444150133), we get a palindrome (45345588554354).

The spelling of 33105144404221 in words is "thirty-three trillion, one hundred five billion, one hundred forty-four million, four hundred four thousand, two hundred twenty-one".