33001121981 has 2 divisors, whose sum is σ = 33001121982. Its totient is φ = 33001121980.

The previous prime is 33001121977. The next prime is 33001122031. The reversal of 33001121981 is 18912110033.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26027368900 + 6973753081 = 161330^2 + 83509^2 .

It is a cyclic number.

It is not a de Polignac number, because 33001121981 - 2² = 33001121977 is a prime.

It is a super-2 number, since 2×33001121981² (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 (33001121911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16500560990 + 16500560991.

It is an arithmetic number, because the mean of its divisors is an integer number (16500560991).

Almost surely, 2^33001121981 is an apocalyptic number.

It is an amenable number.

33001121981 is a deficient number, since it is larger than the sum of its proper divisors (1).

33001121981 is an equidigital number, since it uses as much as digits as its factorization.

33001121981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1296, while the sum is 29.

The spelling of 33001121981 in words is "thirty-three billion, one million, one hundred twenty-one thousand, nine hundred eighty-one".