33105921 has 4 divisors (see below), whose sum is σ = 44141232. Its totient is φ = 22070612.

The previous prime is 33105899. The next prime is 33105931. The reversal of 33105921 is 12950133.

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.

It is a cyclic number.

It is not a de Polignac number, because 33105921 - 2⁶ = 33105857 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 33105891 and 33105900.

It is not an unprimeable number, because it can be changed into a prime (33105931) 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, 5517651 + ... + 5517656.

It is an arithmetic number, because the mean of its divisors is an integer number (11035308).

Almost surely, 2^33105921 is an apocalyptic number.

It is an amenable number.

33105921 is a deficient number, since it is larger than the sum of its proper divisors (11035311).

33105921 is a wasteful number, since it uses less digits than its factorization.

33105921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11035310.

The product of its (nonzero) digits is 810, while the sum is 24.

The square root of 33105921 is about 5753.7745002737. The cubic root of 33105921 is about 321.0962434986.

The spelling of 33105921 in words is "thirty-three million, one hundred five thousand, nine hundred twenty-one".