21171933 has 12 divisors (see below), whose sum is σ = 31039008. Its totient is φ = 13903560.

The previous prime is 21171929. The next prime is 21171961. The reversal of 21171933 is 33917112.

It is not a de Polignac number, because 21171933 - 2² = 21171929 is a prime.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21171897 and 21171906.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21171133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 16953 + ... + 18158.

It is an arithmetic number, because the mean of its divisors is an integer number (2586584).

Almost surely, 2^21171933 is an apocalyptic number.

It is an amenable number.

21171933 is a deficient number, since it is larger than the sum of its proper divisors (9867075).

21171933 is a wasteful number, since it uses less digits than its factorization.

21171933 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35184 (or 35181 counting only the distinct ones).

The product of its digits is 1134, while the sum is 27.

The square root of 21171933 is about 4601.2968824017. The cubic root of 21171933 is about 276.6433087811.

The spelling of 21171933 in words is "twenty-one million, one hundred seventy-one thousand, nine hundred thirty-three".