21396118 has 8 divisors (see below), whose sum is σ = 33489648. Its totient is φ = 10232904.

The previous prime is 21396103. The next prime is 21396119. The reversal of 21396118 is 81169312.

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

It is a self number, because there is not a number n which added to its sum of digits gives 21396118.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21396119) by changing a digit.

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, 232521 + ... + 232612.

It is an arithmetic number, because the mean of its divisors is an integer number (4186206).

Almost surely, 2^21396118 is an apocalyptic number.

21396118 is a deficient number, since it is larger than the sum of its proper divisors (12093530).

21396118 is a wasteful number, since it uses less digits than its factorization.

21396118 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 465158.

The product of its digits is 2592, while the sum is 31.

The square root of 21396118 is about 4625.5937997191. The cubic root of 21396118 is about 277.6163211177.

The spelling of 21396118 in words is "twenty-one million, three hundred ninety-six thousand, one hundred eighteen".