21849750 has 160 divisors (see below), whose sum is σ = 66594528. Its totient is φ = 5313600.

The previous prime is 21849749. The next prime is 21849757. The reversal of 21849750 is 5794812.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21849757) 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 79 ways as a sum of consecutive naturals, for example, 263209 + ... + 263291.

Almost surely, 2^21849750 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21849750, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33297264).

21849750 is an abundant number, since it is smaller than the sum of its proper divisors (44744778).

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

21849750 is a wasteful number, since it uses less digits than its factorization.

21849750 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125 (or 106 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 36.

The square root of 21849750 is about 4674.3716155222. The cubic root of 21849750 is about 279.5645868686.

The spelling of 21849750 in words is "twenty-one million, eight hundred forty-nine thousand, seven hundred fifty".