21318850 has 48 divisors (see below), whose sum is σ = 47996928. Its totient is φ = 6877440.

The previous prime is 21318839. The next prime is 21318859. The reversal of 21318850 is 5881312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21318859) 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, 4159 + ... + 7741.

It is an arithmetic number, because the mean of its divisors is an integer number (999936).

Almost surely, 2^21318850 is an apocalyptic number.

21318850 is an abundant number, since it is smaller than the sum of its proper divisors (26678078).

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

21318850 is a wasteful number, since it uses less digits than its factorization.

21318850 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3619 (or 3614 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 28.

The square root of 21318850 is about 4617.2340204932. The cubic root of 21318850 is about 277.2817318910.

The spelling of 21318850 in words is "twenty-one million, three hundred eighteen thousand, eight hundred fifty".