21887150 has 12 divisors (see below), whose sum is σ = 40710192. Its totient is φ = 8754840.

The previous prime is 21887149. The next prime is 21887167. The reversal of 21887150 is 5178812.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 218822 + ... + 218921.

It is an arithmetic number, because the mean of its divisors is an integer number (3392516).

Almost surely, 2^21887150 is an apocalyptic number.

21887150 is a deficient number, since it is larger than the sum of its proper divisors (18823042).

21887150 is a wasteful number, since it uses less digits than its factorization.

21887150 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 437755 (or 437750 counting only the distinct ones).

The product of its (nonzero) digits is 4480, while the sum is 32.

The square root of 21887150 is about 4678.3704427931. The cubic root of 21887150 is about 279.7240052535.

The spelling of 21887150 in words is "twenty-one million, eight hundred eighty-seven thousand, one hundred fifty".