21416718 has 8 divisors (see below), whose sum is σ = 42833448. Its totient is φ = 7138904.

The previous prime is 21416713. The next prime is 21416729. The reversal of 21416718 is 81761412.

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

21416718 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21416713) 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, 1784721 + ... + 1784732.

It is an arithmetic number, because the mean of its divisors is an integer number (5354181).

Almost surely, 2^21416718 is an apocalyptic number.

21416718 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.

21416718 is a wasteful number, since it uses less digits than its factorization.

21416718 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3569458.

The product of its digits is 2688, while the sum is 30.

The square root of 21416718 is about 4627.8200051428. The cubic root of 21416718 is about 277.7053880819.

It can be divided in two parts, 214167 and 18, that added together give a triangular number (214185 = T₆₅₄).

The spelling of 21416718 in words is "twenty-one million, four hundred sixteen thousand, seven hundred eighteen".