21189150 has 36 divisors (see below), whose sum is σ = 56929392. Its totient is φ = 5650320.

The previous prime is 21189131. The next prime is 21189163. The reversal of 21189150 is 5198112.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 23094 + ... + 23993.

It is an arithmetic number, because the mean of its divisors is an integer number (1581372).

Almost surely, 2^21189150 is an apocalyptic number.

21189150 is an abundant number, since it is smaller than the sum of its proper divisors (35740242).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21189150 is a wasteful number, since it uses less digits than its factorization.

21189150 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47105 (or 47097 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 27.

The square root of 21189150 is about 4603.1673877885. The cubic root of 21189150 is about 276.7182771736.

The spelling of 21189150 in words is "twenty-one million, one hundred eighty-nine thousand, one hundred fifty".