33921139 has 4 divisors (see below), whose sum is σ = 38767024. Its totient is φ = 29075256.

The previous prime is 33921133. The next prime is 33921149. The reversal of 33921139 is 93112933.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93112933 = 31 ⋅3003643.

It is not a de Polignac number, because 33921139 - 2¹¹ = 33919091 is a prime.

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 33921139.

It is not an unprimeable number, because it can be changed into a prime (33921133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2422932 + ... + 2422945.

It is an arithmetic number, because the mean of its divisors is an integer number (9691756).

Almost surely, 2^33921139 is an apocalyptic number.

33921139 is a deficient number, since it is larger than the sum of its proper divisors (4845885).

33921139 is an equidigital number, since it uses as much as digits as its factorization.

33921139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4845884.

The product of its digits is 4374, while the sum is 31.

The square root of 33921139 is about 5824.1856941550. The cubic root of 33921139 is about 323.7105165944.

The spelling of 33921139 in words is "thirty-three million, nine hundred twenty-one thousand, one hundred thirty-nine".