21443230 has 8 divisors (see below), whose sum is σ = 38597832. Its totient is φ = 8577288.

The previous prime is 21443221. The next prime is 21443263. The reversal of 21443230 is 3234412.

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

It is a super-2 number, since 2×21443230² = 919624225665800, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21443198 and 21443207.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 1072152 + ... + 1072171.

It is an arithmetic number, because the mean of its divisors is an integer number (4824729).

Almost surely, 2^21443230 is an apocalyptic number.

21443230 is a deficient number, since it is larger than the sum of its proper divisors (17154602).

21443230 is a wasteful number, since it uses less digits than its factorization.

21443230 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2144330.

The product of its (nonzero) digits is 576, while the sum is 19.

The square root of 21443230 is about 4630.6835348575. The cubic root of 21443230 is about 277.8199323876.

Adding to 21443230 its reverse (3234412), we get a palindrome (24677642).

The spelling of 21443230 in words is "twenty-one million, four hundred forty-three thousand, two hundred thirty".