33121666 has 4 divisors (see below), whose sum is σ = 49682502. Its totient is φ = 16560832.

The previous prime is 33121663. The next prime is 33121681. The reversal of 33121666 is 66612133.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 66612133 = 7 ⋅9516019.

It can be written as a sum of positive squares in only one way, i.e., 19616041 + 13505625 = 4429^2 + 3675^2 .

It is not an unprimeable number, because it can be changed into a prime (33121663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8280415 + ... + 8280418.

Almost surely, 2^33121666 is an apocalyptic number.

33121666 is a deficient number, since it is larger than the sum of its proper divisors (16560836).

33121666 is a wasteful number, since it uses less digits than its factorization.

33121666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16560835.

The product of its digits is 3888, while the sum is 28.

The square root of 33121666 is about 5755.1425699108. The cubic root of 33121666 is about 321.1471393196.

Adding to 33121666 its reverse (66612133), we get a palindrome (99733799).

The spelling of 33121666 in words is "thirty-three million, one hundred twenty-one thousand, six hundred sixty-six".