21446768 has 40 divisors (see below), whose sum is σ = 48398688. Its totient is φ = 9015552.

The previous prime is 21446753. The next prime is 21446779. The reversal of 21446768 is 86764412.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4130 + ... + 7742.

Almost surely, 2^21446768 is an apocalyptic number.

21446768 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21446768, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24199344).

21446768 is an abundant number, since it is smaller than the sum of its proper divisors (26951920).

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

21446768 is a wasteful number, since it uses less digits than its factorization.

21446768 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3681 (or 3675 counting only the distinct ones).

The product of its digits is 64512, while the sum is 38.

The square root of 21446768 is about 4631.0655361374. The cubic root of 21446768 is about 277.8352110695.

The spelling of 21446768 in words is "twenty-one million, four hundred forty-six thousand, seven hundred sixty-eight".