21850950 has 192 divisors, whose sum is σ = 67495680. Its totient is φ = 4608000.

The previous prime is 21850919. The next prime is 21850957. The reversal of 21850950 is 5905812.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21850957) 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 95 ways as a sum of consecutive naturals, for example, 532930 + ... + 532970.

It is an arithmetic number, because the mean of its divisors is an integer number (351540).

Almost surely, 2^21850950 is an apocalyptic number.

It is a pronic number, being equal to 4674×4675.

It is a practical number, because each smaller number is the sum of distinct divisors of 21850950, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33747840).

21850950 is an abundant number, since it is smaller than the sum of its proper divisors (45644730).

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

21850950 is a wasteful number, since it uses less digits than its factorization.

21850950 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103 (or 98 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 30.

The square root of 21850950 is about 4674.4999732592. The cubic root of 21850950 is about 279.5697047206.

The spelling of 21850950 in words is "twenty-one million, eight hundred fifty thousand, nine hundred fifty".