33336721 has 8 divisors (see below), whose sum is σ = 36910944. Its totient is φ = 29853120.

The previous prime is 33336623. The next prime is 33336727. The reversal of 33336721 is 12763333.

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

It is not a de Polignac number, because 33336721 - 2¹⁹ = 32812433 is a prime.

It is a super-2 number, since 2×33336721² = 2222673934063682, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 33336721.

It is not an unprimeable number, because it can be changed into a prime (33336727) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21880 + ... + 23353.

It is an arithmetic number, because the mean of its divisors is an integer number (4613868).

Almost surely, 2^33336721 is an apocalyptic number.

It is an amenable number.

33336721 is a deficient number, since it is larger than the sum of its proper divisors (3574223).

33336721 is a wasteful number, since it uses less digits than its factorization.

33336721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45311.

The product of its digits is 6804, while the sum is 28.

The square root of 33336721 is about 5773.7960649819. The cubic root of 33336721 is about 321.8406970199.

The spelling of 33336721 in words is "thirty-three million, three hundred thirty-six thousand, seven hundred twenty-one".