33313120021 has 2 divisors, whose sum is σ = 33313120022. Its totient is φ = 33313120020.

The previous prime is 33313120013. The next prime is 33313120067. The reversal of 33313120021 is 12002131333.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 32792139396 + 520980625 = 181086^2 + 22825^2 .

It is a cyclic number.

It is not a de Polignac number, because 33313120021 - 2³ = 33313120013 is a prime.

It is a super-2 number, since 2×33313120021² (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 (33313120081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16656560010 + 16656560011.

It is an arithmetic number, because the mean of its divisors is an integer number (16656560011).

Almost surely, 2^33313120021 is an apocalyptic number.

It is an amenable number.

33313120021 is a deficient number, since it is larger than the sum of its proper divisors (1).

33313120021 is an equidigital number, since it uses as much as digits as its factorization.

33313120021 is an odious number, because the sum of its binary digits is odd.

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

Adding to 33313120021 its reverse (12002131333), we get a palindrome (45315251354).

The spelling of 33313120021 in words is "thirty-three billion, three hundred thirteen million, one hundred twenty thousand, twenty-one".