21452748 has 48 divisors (see below), whose sum is σ = 54136320. Its totient is φ = 6588864.

The previous prime is 21452747. The next prime is 21452749. The reversal of 21452748 is 84725412.

It is an interprime number because it is at equal distance from previous prime (21452747) and next prime (21452749).

It is a super-4 number, since 4×21452748⁴ (a number of 30 digits) contains 4444 as substring.

It is not an unprimeable number, because it can be changed into a prime (21452741) 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, 7165 + ... + 9707.

It is an arithmetic number, because the mean of its divisors is an integer number (1127840).

Almost surely, 2^21452748 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 21452748, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27068160).

21452748 is an abundant number, since it is smaller than the sum of its proper divisors (32683572).

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

21452748 is a wasteful number, since it uses less digits than its factorization.

21452748 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2606 (or 2604 counting only the distinct ones).

The product of its digits is 17920, while the sum is 33.

The square root of 21452748 is about 4631.7111308889. The cubic root of 21452748 is about 277.8610315904.

The spelling of 21452748 in words is "twenty-one million, four hundred fifty-two thousand, seven hundred forty-eight".