21936750 has 64 divisors (see below), whose sum is σ = 59754240. Its totient is φ = 5316000.

The previous prime is 21936743. The next prime is 21936757. The reversal of 21936750 is 5763912.

It is an interprime number because it is at equal distance from previous prime (21936743) and next prime (21936757).

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21936757) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6921 + ... + 9579.

It is an arithmetic number, because the mean of its divisors is an integer number (933660).

Almost surely, 2^21936750 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21936750, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29877120).

21936750 is an abundant number, since it is smaller than the sum of its proper divisors (37817490).

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

21936750 is a wasteful number, since it uses less digits than its factorization.

21936750 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2690 (or 2680 counting only the distinct ones).

The product of its (nonzero) digits is 11340, while the sum is 33.

The square root of 21936750 is about 4683.6684340376. The cubic root of 21936750 is about 279.9351465445.

The spelling of 21936750 in words is "twenty-one million, nine hundred thirty-six thousand, seven hundred fifty".