21363472 has 40 divisors (see below), whose sum is σ = 44858240. Its totient is φ = 9797760.

The previous prime is 21363469. The next prime is 21363497. The reversal of 21363472 is 27436312.

It is a self number, because there is not a number n which added to its sum of digits gives 21363472.

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, 56179 + ... + 56557.

It is an arithmetic number, because the mean of its divisors is an integer number (1121456).

Almost surely, 2^21363472 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 21363472, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22429120).

21363472 is an abundant number, since it is smaller than the sum of its proper divisors (23494768).

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

21363472 is a wasteful number, since it uses less digits than its factorization.

21363472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 671 (or 665 counting only the distinct ones).

The product of its digits is 6048, while the sum is 28.

The square root of 21363472 is about 4622.0636083897. The cubic root of 21363472 is about 277.4750544359.

Adding to 21363472 its reverse (27436312), we get a palindrome (48799784).

The spelling of 21363472 in words is "twenty-one million, three hundred sixty-three thousand, four hundred seventy-two".