21752948 has 48 divisors (see below), whose sum is σ = 47308800. Its totient is φ = 8540640.

The previous prime is 21752947. The next prime is 21752959. The reversal of 21752948 is 84925712.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21752947) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15833 + ... + 17151.

It is an arithmetic number, because the mean of its divisors is an integer number (985600).

Almost surely, 2^21752948 is an apocalyptic number.

21752948 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21752948, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23654400).

21752948 is an abundant number, since it is smaller than the sum of its proper divisors (25555852).

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

21752948 is a wasteful number, since it uses less digits than its factorization.

21752948 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1380 (or 1378 counting only the distinct ones).

The product of its digits is 40320, while the sum is 38.

The square root of 21752948 is about 4664.0055746107. The cubic root of 21752948 is about 279.1511195124.

The spelling of 21752948 in words is "twenty-one million, seven hundred fifty-two thousand, nine hundred forty-eight".