21426318 has 24 divisors (see below), whose sum is σ = 46526688. Its totient is φ = 7126272.

The previous prime is 21426289. The next prime is 21426329. The reversal of 21426318 is 81362412.

21426318 is a `hidden beast` number, since 21 + 4 + 2 + 631 + 8 = 666.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21426291 and 21426300.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9355 + ... + 11417.

It is an arithmetic number, because the mean of its divisors is an integer number (1938612).

Almost surely, 2^21426318 is an apocalyptic number.

21426318 is an abundant number, since it is smaller than the sum of its proper divisors (25100370).

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

21426318 is a wasteful number, since it uses less digits than its factorization.

21426318 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2648 (or 2645 counting only the distinct ones).

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

The square root of 21426318 is about 4628.8570943593. The cubic root of 21426318 is about 277.7468755075.

The spelling of 21426318 in words is "twenty-one million, four hundred twenty-six thousand, three hundred eighteen".