21243468 has 24 divisors (see below), whose sum is σ = 49759920. Its totient is φ = 7053760.

The previous prime is 21243437. The next prime is 21243473. The reversal of 21243468 is 86434212.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 63 + ... + 6518.

It is an arithmetic number, because the mean of its divisors is an integer number (2073330).

Almost surely, 2^21243468 is an apocalyptic number.

It is an amenable number.

21243468 is an abundant number, since it is smaller than the sum of its proper divisors (28516452).

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

21243468 is a wasteful number, since it uses less digits than its factorization.

21243468 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6857 (or 6855 counting only the distinct ones).

The product of its digits is 9216, while the sum is 30.

The square root of 21243468 is about 4609.0636793171. The cubic root of 21243468 is about 276.9545294997.

The spelling of 21243468 in words is "twenty-one million, two hundred forty-three thousand, four hundred sixty-eight".