21246318 has 12 divisors (see below), whose sum is σ = 46033728. Its totient is φ = 7082100.

The previous prime is 21246317. The next prime is 21246341. The reversal of 21246318 is 81364212.

21246318 is a `hidden beast` number, since 2 + 1 + 24 + 631 + 8 = 666.

It is a Smith number, since the sum of its digits (27) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 21246291 and 21246300.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21246317) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 590158 + ... + 590193.

It is an arithmetic number, because the mean of its divisors is an integer number (3836144).

Almost surely, 2^21246318 is an apocalyptic number.

21246318 is an abundant number, since it is smaller than the sum of its proper divisors (24787410).

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

21246318 is a wasteful number, since it uses less digits than its factorization.

21246318 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1180359 (or 1180356 counting only the distinct ones).

The product of its digits is 2304, while the sum is 27.

The square root of 21246318 is about 4609.3728423724. The cubic root of 21246318 is about 276.9669142496.

The spelling of 21246318 in words is "twenty-one million, two hundred forty-six thousand, three hundred eighteen".