21363678 has 24 divisors (see below), whose sum is σ = 52900848. Its totient is φ = 6103872.

The previous prime is 21363659. The next prime is 21363703. The reversal of 21363678 is 87636312.

It is a happy number.

21363678 is a `hidden beast` number, since 2 + 13 + 636 + 7 + 8 = 666.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 84651 + ... + 84902.

It is an arithmetic number, because the mean of its divisors is an integer number (2204202).

Almost surely, 2^21363678 is an apocalyptic number.

21363678 is an abundant number, since it is smaller than the sum of its proper divisors (31537170).

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

21363678 is a wasteful number, since it uses less digits than its factorization.

21363678 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 169568 (or 169565 counting only the distinct ones).

The product of its digits is 36288, while the sum is 36.

The square root of 21363678 is about 4622.0858927545. The cubic root of 21363678 is about 277.4759462959.

The spelling of 21363678 in words is "twenty-one million, three hundred sixty-three thousand, six hundred seventy-eight".