33421331 has 2 divisors, whose sum is σ = 33421332. Its totient is φ = 33421330.

The previous prime is 33421327. The next prime is 33421387. The reversal of 33421331 is 13312433.

It is a weak prime.

It is an emirp because it is prime and its reverse (13312433) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 33421331 - 2² = 33421327 is a prime.

It is a super-2 number, since 2×33421331² = 2233970731623122, which contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (33451331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16710665 + 16710666.

It is an arithmetic number, because the mean of its divisors is an integer number (16710666).

Almost surely, 2^33421331 is an apocalyptic number.

33421331 is a deficient number, since it is larger than the sum of its proper divisors (1).

33421331 is an equidigital number, since it uses as much as digits as its factorization.

33421331 is an evil number, because the sum of its binary digits is even.

The product of its digits is 648, while the sum is 20.

The square root of 33421331 is about 5781.1184903961. The cubic root of 33421331 is about 322.1127487317.

Adding to 33421331 its reverse (13312433), we get a palindrome (46733764).

The spelling of 33421331 in words is "thirty-three million, four hundred twenty-one thousand, three hundred thirty-one".