21068250 has 64 divisors (see below), whose sum is σ = 60113664. Its totient is φ = 4814400.

The previous prime is 21068249. The next prime is 21068263. The reversal of 21068250 is 5286012.

It is a self number, because there is not a number n which added to its sum of digits gives 21068250.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3244 + ... + 7256.

It is an arithmetic number, because the mean of its divisors is an integer number (939276).

Almost surely, 2^21068250 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21068250, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30056832).

21068250 is an abundant number, since it is smaller than the sum of its proper divisors (39045414).

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

21068250 is a wasteful number, since it uses less digits than its factorization.

21068250 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4040 (or 4030 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 24.

The square root of 21068250 is about 4590.0163398402. The cubic root of 21068250 is about 276.1909778835.

The spelling of 21068250 in words is "twenty-one million, sixty-eight thousand, two hundred fifty".