21175036 has 12 divisors (see below), whose sum is σ = 37190160. Its totient is φ = 10549280.

The previous prime is 21175031. The next prime is 21175039. The reversal of 21175036 is 63057112.

It is a self number, because there is not a number n which added to its sum of digits gives 21175036.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21175031) 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 3 ways as a sum of consecutive naturals, for example, 8296 + ... + 10543.

It is an arithmetic number, because the mean of its divisors is an integer number (3099180).

Almost surely, 2^21175036 is an apocalyptic number.

It is an amenable number.

21175036 is a deficient number, since it is larger than the sum of its proper divisors (16015124).

21175036 is a wasteful number, since it uses less digits than its factorization.

21175036 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19124 (or 19122 counting only the distinct ones).

The product of its (nonzero) digits is 1260, while the sum is 25.

The square root of 21175036 is about 4601.6340575930. The cubic root of 21175036 is about 276.6568232494.

The spelling of 21175036 in words is "twenty-one million, one hundred seventy-five thousand, thirty-six".