21875850 has 72 divisors (see below), whose sum is σ = 59323212. Its totient is φ = 5779200.

The previous prime is 21875849. The next prime is 21875857. The reversal of 21875850 is 5857812.

It can be written as a sum of positive squares in 6 ways, for example, as 14953689 + 6922161 = 3867^2 + 2631^2 .

It is not an unprimeable number, because it can be changed into a prime (21875857) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 77710 + ... + 77990.

Almost surely, 2^21875850 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21875850, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29661606).

21875850 is an abundant number, since it is smaller than the sum of its proper divisors (37447362).

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

21875850 is a wasteful number, since it uses less digits than its factorization.

21875850 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 472 (or 464 counting only the distinct ones).

The product of its (nonzero) digits is 22400, while the sum is 36.

The square root of 21875850 is about 4677.1626014070. The cubic root of 21875850 is about 279.6758578948.

The spelling of 21875850 in words is "twenty-one million, eight hundred seventy-five thousand, eight hundred fifty".