21294450 has 72 divisors (see below), whose sum is σ = 58032000. Its totient is φ = 5597280.

The previous prime is 21294419. The next prime is 21294451. The reversal of 21294450 is 5449212.

21294450 is a `hidden beast` number, since 212 + 9 + 445 + 0 = 666.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21294451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 35251 + ... + 35849.

It is an arithmetic number, because the mean of its divisors is an integer number (806000).

Almost surely, 2^21294450 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21294450, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29016000).

21294450 is an abundant number, since it is smaller than the sum of its proper divisors (36737550).

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

21294450 is a wasteful number, since it uses less digits than its factorization.

21294450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 696 (or 688 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 21294450 is about 4614.5909894594. The cubic root of 21294450 is about 277.1759060285.

The spelling of 21294450 in words is "twenty-one million, two hundred ninety-four thousand, four hundred fifty".