33408821 has 4 divisors (see below), whose sum is σ = 35167200. Its totient is φ = 31650444.

The previous prime is 33408803. The next prime is 33408847. The reversal of 33408821 is 12880433.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12880433 = 1867 ⋅6899.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-33408821 is a prime.

It is a super-2 number, since 2×33408821² = 2232298641220082, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (33408871) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 879161 + ... + 879198.

It is an arithmetic number, because the mean of its divisors is an integer number (8791800).

Almost surely, 2^33408821 is an apocalyptic number.

It is an amenable number.

33408821 is a deficient number, since it is larger than the sum of its proper divisors (1758379).

33408821 is a wasteful number, since it uses less digits than its factorization.

33408821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1758378.

The product of its (nonzero) digits is 4608, while the sum is 29.

The square root of 33408821 is about 5780.0364185704. The cubic root of 33408821 is about 322.0725535106.

The spelling of 33408821 in words is "thirty-three million, four hundred eight thousand, eight hundred twenty-one".