21937248 has 108 divisors (see below), whose sum is σ = 66152268. Its totient is φ = 6894720.

The previous prime is 21937241. The next prime is 21937261. The reversal of 21937248 is 84273912.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21937241) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 103863 + ... + 104073.

It is an arithmetic number, because the mean of its divisors is an integer number (612521).

Almost surely, 2^21937248 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 21937248, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33076134).

21937248 is an abundant number, since it is smaller than the sum of its proper divisors (44215020).

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

21937248 is a wasteful number, since it uses less digits than its factorization.

21937248 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 265 (or 235 counting only the distinct ones).

The product of its digits is 24192, while the sum is 36.

The square root of 21937248 is about 4683.7215971917. The cubic root of 21937248 is about 279.9372648565.

The spelling of 21937248 in words is "twenty-one million, nine hundred thirty-seven thousand, two hundred forty-eight".