21443084 has 24 divisors (see below), whose sum is σ = 42171360. Its totient is φ = 9465984.

The previous prime is 21443083. The next prime is 21443087. The reversal of 21443084 is 48034412.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is not an unprimeable number, because it can be changed into a prime (21443083) 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, 7769 + ... + 10160.

It is an arithmetic number, because the mean of its divisors is an integer number (1757140).

Almost surely, 2^21443084 is an apocalyptic number.

It is an amenable number.

21443084 is a deficient number, since it is larger than the sum of its proper divisors (20728276).

21443084 is a wasteful number, since it uses less digits than its factorization.

21443084 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17969 (or 17967 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 26.

The square root of 21443084 is about 4630.6677704193. The cubic root of 21443084 is about 277.8193018576.

Adding to 21443084 its reverse (48034412), we get a palindrome (69477496).

The spelling of 21443084 in words is "twenty-one million, four hundred forty-three thousand, eighty-four".