21443080 has 32 divisors (see below), whose sum is σ = 48470400. Its totient is φ = 8537536.

The previous prime is 21443053. The next prime is 21443083. The reversal of 21443080 is 8034412.

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, 8439 + ... + 10681.

It is an arithmetic number, because the mean of its divisors is an integer number (1514700).

Almost surely, 2^21443080 is an apocalyptic number.

21443080 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21443080 is an abundant number, since it is smaller than the sum of its proper divisors (27027320).

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

21443080 is a wasteful number, since it uses less digits than its factorization.

21443080 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2493 (or 2489 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 22.

The square root of 21443080 is about 4630.6673385161. The cubic root of 21443080 is about 277.8192845827.

Adding to 21443080 its reverse (8034412), we get a palindrome (29477492).

The spelling of 21443080 in words is "twenty-one million, four hundred forty-three thousand, eighty".