21700318 has 16 divisors (see below), whose sum is σ = 34848000. Its totient is φ = 10103832.

The previous prime is 21700303. The next prime is 21700319. The reversal of 21700318 is 81300712.

It is a super-2 number, since 2×21700318² = 941807602602248, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21700319) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2598 + ... + 7081.

It is an arithmetic number, because the mean of its divisors is an integer number (2178000).

Almost surely, 2^21700318 is an apocalyptic number.

21700318 is a deficient number, since it is larger than the sum of its proper divisors (13147682).

21700318 is a wasteful number, since it uses less digits than its factorization.

21700318 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9759.

The product of its (nonzero) digits is 336, while the sum is 22.

The square root of 21700318 is about 4658.3600118497. The cubic root of 21700318 is about 278.9258077069.

The spelling of 21700318 in words is "twenty-one million, seven hundred thousand, three hundred eighteen".