21452800 has 72 divisors (see below), whose sum is σ = 53316900. Its totient is φ = 8560640.

The previous prime is 21452789. The next prime is 21452801. The reversal of 21452800 is 825412.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21452801) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 50991 + ... + 51409.

Almost surely, 2^21452800 is an apocalyptic number.

21452800 is a gapful number since it is divisible by the number (20) 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 21452800, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26658450).

21452800 is an abundant number, since it is smaller than the sum of its proper divisors (31864100).

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

21452800 is an equidigital number, since it uses as much as digits as its factorization.

21452800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 451 (or 426 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 22.

The square root of 21452800 is about 4631.7167443616. The cubic root of 21452800 is about 277.8612560956.

The spelling of 21452800 in words is "twenty-one million, four hundred fifty-two thousand, eight hundred".