21243466 has 8 divisors (see below), whose sum is σ = 31955040. Its totient is φ = 10591788.

The previous prime is 21243437. The next prime is 21243473. The reversal of 21243466 is 66434212.

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14076 + ... + 15511.

It is an arithmetic number, because the mean of its divisors is an integer number (3994380).

Almost surely, 2^21243466 is an apocalyptic number.

21243466 is a deficient number, since it is larger than the sum of its proper divisors (10711574).

21243466 is a wasteful number, since it uses less digits than its factorization.

21243466 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29948.

The product of its digits is 6912, while the sum is 28.

The square root of 21243466 is about 4609.0634623533. The cubic root of 21243466 is about 276.9545208083.

Adding to 21243466 its reverse (66434212), we get a palindrome (87677678).

The spelling of 21243466 in words is "twenty-one million, two hundred forty-three thousand, four hundred sixty-six".