33881021 has 2 divisors, whose sum is σ = 33881022. Its totient is φ = 33881020.

The previous prime is 33880991. The next prime is 33881027. The reversal of 33881021 is 12018833.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 33477796 + 403225 = 5786^2 + 635^2 .

It is an emirp because it is prime and its reverse (12018833) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 33881021 - 2¹⁴ = 33864637 is a prime.

It is a super-2 number, since 2×33881021² = 2295847168004882, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (33881027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16940510 + 16940511.

It is an arithmetic number, because the mean of its divisors is an integer number (16940511).

Almost surely, 2^33881021 is an apocalyptic number.

It is an amenable number.

33881021 is a deficient number, since it is larger than the sum of its proper divisors (1).

33881021 is an equidigital number, since it uses as much as digits as its factorization.

33881021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 33881021 is about 5820.7405886193. The cubic root of 33881021 is about 323.5828504650.

Adding to 33881021 its reverse (12018833), we get a palindrome (45899854).

The spelling of 33881021 in words is "thirty-three million, eight hundred eighty-one thousand, twenty-one".