21716850 has 24 divisors (see below), whose sum is σ = 53858160. Its totient is φ = 5791120.

The previous prime is 21716831. The next prime is 21716857. The reversal of 21716850 is 5861712.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (21716857) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 72240 + ... + 72539.

It is an arithmetic number, because the mean of its divisors is an integer number (2244090).

Almost surely, 2^21716850 is an apocalyptic number.

21716850 is an abundant number, since it is smaller than the sum of its proper divisors (32141310).

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

21716850 is a wasteful number, since it uses less digits than its factorization.

21716850 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144794 (or 144789 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 30.

The square root of 21716850 is about 4660.1341182417. The cubic root of 21716850 is about 278.9966212769.

The spelling of 21716850 in words is "twenty-one million, seven hundred sixteen thousand, eight hundred fifty".