21450852 has 48 divisors (see below), whose sum is σ = 56306880. Its totient is φ = 7061184.

The previous prime is 21450839. The next prime is 21450859. The reversal of 21450852 is 25805412.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (21450859) 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, 7768 + ... + 10160.

It is an arithmetic number, because the mean of its divisors is an integer number (1173060).

Almost surely, 2^21450852 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 21450852, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28153440).

21450852 is an abundant number, since it is smaller than the sum of its proper divisors (34856028).

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

21450852 is a wasteful number, since it uses less digits than its factorization.

21450852 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2489 (or 2481 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 27.

The square root of 21450852 is about 4631.5064503895. The cubic root of 21450852 is about 277.8528455368.

The spelling of 21450852 in words is "twenty-one million, four hundred fifty thousand, eight hundred fifty-two".