21850050 has 48 divisors (see below), whose sum is σ = 56067840. Its totient is φ = 5624640.

The previous prime is 21850043. The next prime is 21850051. The reversal of 21850050 is 5005812.

It is a junction number, because it is equal to n+sod(n) for n = 21849999 and 21850026.

It is not an unprimeable number, because it can be changed into a prime (21850051) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 1839 + ... + 6861.

It is an arithmetic number, because the mean of its divisors is an integer number (1168080).

Almost surely, 2^21850050 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21850050, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28033920).

21850050 is an abundant number, since it is smaller than the sum of its proper divisors (34217790).

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

21850050 is a wasteful number, since it uses less digits than its factorization.

21850050 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5067 (or 5062 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 21.

The square root of 21850050 is about 4674.4037052869. The cubic root of 21850050 is about 279.5658663491.

Adding to 21850050 its reverse (5005812), we get a palindrome (26855862).

The spelling of 21850050 in words is "twenty-one million, eight hundred fifty thousand, fifty".