21175150 has 12 divisors (see below), whose sum is σ = 39385872. Its totient is φ = 8470040.

The previous prime is 21175129. The next prime is 21175151. The reversal of 21175150 is 5157112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21175151) 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 5 ways as a sum of consecutive naturals, for example, 211702 + ... + 211801.

It is an arithmetic number, because the mean of its divisors is an integer number (3282156).

Almost surely, 2^21175150 is an apocalyptic number.

21175150 is a deficient number, since it is larger than the sum of its proper divisors (18210722).

21175150 is a wasteful number, since it uses less digits than its factorization.

21175150 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 423515 (or 423510 counting only the distinct ones).

The product of its (nonzero) digits is 350, while the sum is 22.

The square root of 21175150 is about 4601.6464444805. The cubic root of 21175150 is about 276.6573197275.

The spelling of 21175150 in words is "twenty-one million, one hundred seventy-five thousand, one hundred fifty".