21416028 has 48 divisors (see below), whose sum is σ = 51480576. Its totient is φ = 6926400.

The previous prime is 21416023. The next prime is 21416029. The reversal of 21416028 is 82061412.

It is a junction number, because it is equal to n+sod(n) for n = 21415989 and 21416007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21416023) 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 15 ways as a sum of consecutive naturals, for example, 95925 + ... + 96147.

It is an arithmetic number, because the mean of its divisors is an integer number (1072512).

Almost surely, 2^21416028 is an apocalyptic number.

It is an amenable number.

21416028 is an abundant number, since it is smaller than the sum of its proper divisors (30064548).

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

21416028 is a wasteful number, since it uses less digits than its factorization.

21416028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 434 (or 432 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 24.

The square root of 21416028 is about 4627.7454554027. The cubic root of 21416028 is about 277.7024056956.

The spelling of 21416028 in words is "twenty-one million, four hundred sixteen thousand, twenty-eight".