21450443 has 8 divisors (see below), whose sum is σ = 24657888. Its totient is φ = 18278784.

The previous prime is 21450433. The next prime is 21450461. The reversal of 21450443 is 34405412.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21450443 - 2¹⁶ = 21384907 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21450433) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7646 + ... + 10067.

It is an arithmetic number, because the mean of its divisors is an integer number (3082236).

Almost surely, 2^21450443 is an apocalyptic number.

21450443 is a deficient number, since it is larger than the sum of its proper divisors (3207445).

21450443 is a wasteful number, since it uses less digits than its factorization.

21450443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17893.

The product of its (nonzero) digits is 1920, while the sum is 23.

The square root of 21450443 is about 4631.4622960789. The cubic root of 21450443 is about 277.8510796001.

Adding to 21450443 its reverse (34405412), we get a palindrome (55855855).

The spelling of 21450443 in words is "twenty-one million, four hundred fifty thousand, four hundred forty-three".