21363120 has 60 divisors (see below), whose sum is σ = 71746896. Its totient is φ = 5696640.

The previous prime is 21363107. The next prime is 21363143. The reversal of 21363120 is 2136312.

21363120 is a `hidden beast` number, since 2 + 13 + 631 + 20 = 666.

It is a tau number, because it is divible by the number of its divisors (60).

It is a super-2 number, since 2×21363120² = 912765792268800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 21363093 and 21363102.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14116 + ... + 15555.

Almost surely, 2^21363120 is an apocalyptic number.

21363120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21363120 is an abundant number, since it is smaller than the sum of its proper divisors (50383776).

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

21363120 is a wasteful number, since it uses less digits than its factorization.

21363120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29690 (or 29681 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

The square root of 21363120 is about 4622.0255300031. The cubic root of 21363120 is about 277.4735304677.

Adding to 21363120 its reverse (2136312), we get a palindrome (23499432).

The spelling of 21363120 in words is "twenty-one million, three hundred sixty-three thousand, one hundred twenty".