21853850 has 12 divisors (see below), whose sum is σ = 40648254. Its totient is φ = 8741520.

The previous prime is 21853831. The next prime is 21853889. The reversal of 21853850 is 5835812.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 19509889 + 2343961 = 4417^2 + 1531^2 .

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, 218489 + ... + 218588.

Almost surely, 2^21853850 is an apocalyptic number.

21853850 is a deficient number, since it is larger than the sum of its proper divisors (18794404).

21853850 is a wasteful number, since it uses less digits than its factorization.

21853850 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 437089 (or 437084 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 32.

The square root of 21853850 is about 4674.8101565732. The cubic root of 21853850 is about 279.5820720895.

The spelling of 21853850 in words is "twenty-one million, eight hundred fifty-three thousand, eight hundred fifty".