33121880081 has 2 divisors, whose sum is σ = 33121880082. Its totient is φ = 33121880080.

The previous prime is 33121880069. The next prime is 33121880111. The reversal of 33121880081 is 18008812133.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 29312521681 + 3809358400 = 171209^2 + 61720^2 .

It is a cyclic number.

It is not a de Polignac number, because 33121880081 - 2¹⁸ = 33121617937 is a prime.

It is a super-2 number, since 2×33121880081² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (33121880021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16560940040 + 16560940041.

It is an arithmetic number, because the mean of its divisors is an integer number (16560940041).

Almost surely, 2^33121880081 is an apocalyptic number.

It is an amenable number.

33121880081 is a deficient number, since it is larger than the sum of its proper divisors (1).

33121880081 is an equidigital number, since it uses as much as digits as its factorization.

33121880081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9216, while the sum is 35.

The spelling of 33121880081 in words is "thirty-three billion, one hundred twenty-one million, eight hundred eighty thousand, eighty-one".