33421921 has 8 divisors (see below), whose sum is σ = 37558080. Its totient is φ = 29509392.

The previous prime is 33421889. The next prime is 33421939. The reversal of 33421921 is 12912433.

33421921 = 174² + 175² + ... + 472².

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 33421921 - 2⁵ = 33421889 is a prime.

It is a super-2 number, since 2×33421921² = 2234049606660482, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (33421981) 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 7 ways as a sum of consecutive naturals, for example, 55591 + ... + 56188.

It is an arithmetic number, because the mean of its divisors is an integer number (4694760).

Almost surely, 2^33421921 is an apocalyptic number.

It is an amenable number.

33421921 is a deficient number, since it is larger than the sum of its proper divisors (4136159).

33421921 is a wasteful number, since it uses less digits than its factorization.

33421921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111815.

The product of its digits is 1296, while the sum is 25.

The square root of 33421921 is about 5781.1695183587. The cubic root of 33421921 is about 322.1146441819.

The spelling of 33421921 in words is "thirty-three million, four hundred twenty-one thousand, nine hundred twenty-one".