21924936 has 192 divisors, whose sum is σ = 71884800. Its totient is φ = 5961600.

The previous prime is 21924923. The next prime is 21924937. The reversal of 21924936 is 63942912.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 21924936.

It is not an unprimeable number, because it can be changed into a prime (21924937) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 466465 + ... + 466511.

It is an arithmetic number, because the mean of its divisors is an integer number (374400).

Almost surely, 2^21924936 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21924936, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35942400).

21924936 is an abundant number, since it is smaller than the sum of its proper divisors (49959864).

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

21924936 is a wasteful number, since it uses less digits than its factorization.

21924936 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120 (or 113 counting only the distinct ones).

The product of its digits is 23328, while the sum is 36.

The square root of 21924936 is about 4682.4070732904. The cubic root of 21924936 is about 279.8848846523.

The spelling of 21924936 in words is "twenty-one million, nine hundred twenty-four thousand, nine hundred thirty-six".