33721138 has 8 divisors (see below), whose sum is σ = 55180080. Its totient is φ = 15327780.

The previous prime is 33721133. The next prime is 33721139. The reversal of 33721138 is 83112733.

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

It is a super-2 number, since 2×33721138² = 2274230296030088, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (33721133) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 766368 + ... + 766411.

It is an arithmetic number, because the mean of its divisors is an integer number (6897510).

Almost surely, 2^33721138 is an apocalyptic number.

33721138 is a deficient number, since it is larger than the sum of its proper divisors (21458942).

33721138 is a wasteful number, since it uses less digits than its factorization.

33721138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1532792.

The product of its digits is 3024, while the sum is 28.

The square root of 33721138 is about 5806.9904425614. The cubic root of 33721138 is about 323.0730567972.

The spelling of 33721138 in words is "thirty-three million, seven hundred twenty-one thousand, one hundred thirty-eight".