21446718 has 48 divisors (see below), whose sum is σ = 46584720. Its totient is φ = 6573952.

The previous prime is 21446701. The next prime is 21446729. The reversal of 21446718 is 81764412.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 91930 + ... + 92162.

It is an arithmetic number, because the mean of its divisors is an integer number (970515).

Almost surely, 2^21446718 is an apocalyptic number.

21446718 is an abundant number, since it is smaller than the sum of its proper divisors (25138002).

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

21446718 is a wasteful number, since it uses less digits than its factorization.

21446718 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 313 (or 290 counting only the distinct ones).

The product of its digits is 10752, while the sum is 33.

The square root of 21446718 is about 4631.0601378086. The cubic root of 21446718 is about 277.8349951586.

The spelling of 21446718 in words is "twenty-one million, four hundred forty-six thousand, seven hundred eighteen".