21486336 has 72 divisors (see below), whose sum is σ = 57959664. Its totient is φ = 7065600.

The previous prime is 21486331. The next prime is 21486371. The reversal of 21486336 is 63368412.

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 21486297 and 21486306.

It is not an unprimeable number, because it can be changed into a prime (21486331) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 77430 + ... + 77706.

Almost surely, 2^21486336 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21486336, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28979832).

21486336 is an abundant number, since it is smaller than the sum of its proper divisors (36473328).

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

21486336 is a wasteful number, since it uses less digits than its factorization.

21486336 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 397 (or 383 counting only the distinct ones).

The product of its digits is 20736, while the sum is 33.

The square root of 21486336 is about 4635.3355865568. The cubic root of 21486336 is about 278.0059691971.

The spelling of 21486336 in words is "twenty-one million, four hundred eighty-six thousand, three hundred thirty-six".