33661321 has 2 divisors, whose sum is σ = 33661322. Its totient is φ = 33661320.

The previous prime is 33661301. The next prime is 33661333. The reversal of 33661321 is 12316633.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 31136400 + 2524921 = 5580^2 + 1589^2 .

It is a cyclic number.

It is not a de Polignac number, because 33661321 - 2¹⁷ = 33530249 is a prime.

It is a super-2 number, since 2×33661321² = 2266169062930082, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (33661301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16830660 + 16830661.

It is an arithmetic number, because the mean of its divisors is an integer number (16830661).

Almost surely, 2^33661321 is an apocalyptic number.

It is an amenable number.

33661321 is a deficient number, since it is larger than the sum of its proper divisors (1).

33661321 is an equidigital number, since it uses as much as digits as its factorization.

33661321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1944, while the sum is 25.

The square root of 33661321 is about 5801.8377261002. The cubic root of 33661321 is about 322.8819135923.

Adding to 33661321 its reverse (12316633), we get a palindrome (45977954).

The spelling of 33661321 in words is "thirty-three million, six hundred sixty-one thousand, three hundred twenty-one".