21316128 has 24 divisors (see below), whose sum is σ = 55955088. Its totient is φ = 7105344.

The previous prime is 21316109. The next prime is 21316133. The reversal of 21316128 is 82161312.

It is a tau number, because it is divible by the number of its divisors (24).

It is a Harshad number since it is a multiple of its sum of digits (24).

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 = 21316098 and 21316107.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 110926 + ... + 111117.

It is an arithmetic number, because the mean of its divisors is an integer number (2331462).

Almost surely, 2^21316128 is an apocalyptic number.

It is an amenable number.

21316128 is an abundant number, since it is smaller than the sum of its proper divisors (34638960).

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

21316128 is a wasteful number, since it uses less digits than its factorization.

21316128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 222056 (or 222048 counting only the distinct ones).

The product of its digits is 576, while the sum is 24.

The square root of 21316128 is about 4616.9392458641. The cubic root of 21316128 is about 277.2699302382.

The spelling of 21316128 in words is "twenty-one million, three hundred sixteen thousand, one hundred twenty-eight".