21700118 has 8 divisors (see below), whose sum is σ = 35509320. Its totient is φ = 9863680.

The previous prime is 21700117. The next prime is 21700123. The reversal of 21700118 is 81100712.

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 21700118.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21700117) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 493163 + ... + 493206.

It is an arithmetic number, because the mean of its divisors is an integer number (4438665).

Almost surely, 2^21700118 is an apocalyptic number.

21700118 is a deficient number, since it is larger than the sum of its proper divisors (13809202).

21700118 is a wasteful number, since it uses less digits than its factorization.

21700118 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 986382.

The product of its (nonzero) digits is 112, while the sum is 20.

The square root of 21700118 is about 4658.3385450180. The cubic root of 21700118 is about 278.9249508019.

The spelling of 21700118 in words is "twenty-one million, seven hundred thousand, one hundred eighteen".