33113320021 has 2 divisors, whose sum is σ = 33113320022. Its totient is φ = 33113320020.

The previous prime is 33113320013. The next prime is 33113320027. The reversal of 33113320021 is 12002331133.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 33113080900 + 239121 = 181970^2 + 489^2 .

It is a cyclic number.

It is not a de Polignac number, because 33113320021 - 2³ = 33113320013 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (33113320027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16556660010 + 16556660011.

It is an arithmetic number, because the mean of its divisors is an integer number (16556660011).

Almost surely, 2^33113320021 is an apocalyptic number.

It is an amenable number.

33113320021 is a deficient number, since it is larger than the sum of its proper divisors (1).

33113320021 is an equidigital number, since it uses as much as digits as its factorization.

33113320021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 324, while the sum is 19.

Adding to 33113320021 its reverse (12002331133), we get a palindrome (45115651154).

The spelling of 33113320021 in words is "thirty-three billion, one hundred thirteen million, three hundred twenty thousand, twenty-one".