21363018 has 8 divisors (see below), whose sum is σ = 42726048. Its totient is φ = 7121004.

The previous prime is 21363007. The next prime is 21363029. The reversal of 21363018 is 81036312.

It is an interprime number because it is at equal distance from previous prime (21363007) and next prime (21363029).

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

21363018 is an admirable number.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1780246 + ... + 1780257.

It is an arithmetic number, because the mean of its divisors is an integer number (5340756).

Almost surely, 2^21363018 is an apocalyptic number.

21363018 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21363018 is a wasteful number, since it uses less digits than its factorization.

21363018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3560508.

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 21363018 is about 4622.0144958665. The cubic root of 21363018 is about 277.4730888602.

The spelling of 21363018 in words is "twenty-one million, three hundred sixty-three thousand, eighteen".