21838850 has 48 divisors (see below), whose sum is σ = 45131040. Its totient is φ = 7795200.

The previous prime is 21838837. The next prime is 21838853. The reversal of 21838850 is 5883812.

It is a self number, because there is not a number n which added to its sum of digits gives 21838850.

It is not an unprimeable number, because it can be changed into a prime (21838853) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 32114 + ... + 32786.

It is an arithmetic number, because the mean of its divisors is an integer number (940230).

Almost surely, 2^21838850 is an apocalyptic number.

21838850 is an abundant number, since it is smaller than the sum of its proper divisors (23292190).

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

21838850 is a wasteful number, since it uses less digits than its factorization.

21838850 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 755 (or 750 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 35.

The square root of 21838850 is about 4673.2055379579. The cubic root of 21838850 is about 279.5180911290.

The spelling of 21838850 in words is "twenty-one million, eight hundred thirty-eight thousand, eight hundred fifty".