21250350 has 168 divisors, whose sum is σ = 65868552. Its totient is φ = 5054400.

The previous prime is 21250337. The next prime is 21250351. The reversal of 21250350 is 5305212.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21250351) by changing a digit.

It is a polite number, since it can be written in 83 ways as a sum of consecutive naturals, for example, 400924 + ... + 400976.

Almost surely, 2^21250350 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21250350, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32934276).

21250350 is an abundant number, since it is smaller than the sum of its proper divisors (44618202).

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

21250350 is a wasteful number, since it uses less digits than its factorization.

21250350 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94 (or 74 counting only the distinct ones).

The product of its (nonzero) digits is 300, while the sum is 18.

The square root of 21250350 is about 4609.8101913202. The cubic root of 21250350 is about 276.9844335199.

Adding to 21250350 its reverse (5305212), we get a palindrome (26555562).

The spelling of 21250350 in words is "twenty-one million, two hundred fifty thousand, three hundred fifty".