21165933 has 16 divisors (see below), whose sum is σ = 29500416. Its totient is φ = 13485360.

The previous prime is 21165923. The next prime is 21165941. The reversal of 21165933 is 33956112.

It is not a de Polignac number, because 21165933 - 2⁶ = 21165869 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21165933.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21165923) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4318 + ... + 7808.

It is an arithmetic number, because the mean of its divisors is an integer number (1843776).

Almost surely, 2^21165933 is an apocalyptic number.

It is an amenable number.

21165933 is a deficient number, since it is larger than the sum of its proper divisors (8334483).

21165933 is a wasteful number, since it uses less digits than its factorization.

21165933 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3584.

The product of its digits is 4860, while the sum is 30.

The square root of 21165933 is about 4600.6448461058. The cubic root of 21165933 is about 276.6171732888.

The spelling of 21165933 in words is "twenty-one million, one hundred sixty-five thousand, nine hundred thirty-three".