21114016 has 144 divisors (see below), whose sum is σ = 56306880. Its totient is φ = 7603200.

The previous prime is 21114011. The next prime is 21114019. The reversal of 21114016 is 61041112.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is not an unprimeable number, because it can be changed into a prime (21114011) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 514956 + ... + 514996.

It is an arithmetic number, because the mean of its divisors is an integer number (391020).

Almost surely, 2^21114016 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 21114016, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28153440).

21114016 is an abundant number, since it is smaller than the sum of its proper divisors (35192864).

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

21114016 is a wasteful number, since it uses less digits than its factorization.

21114016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99 (or 80 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 16.

The square root of 21114016 is about 4594.9990206745. Note that the first 3 decimals coincide. The cubic root of 21114016 is about 276.3908206912.

Adding to 21114016 its reverse (61041112), we get a palindrome (82155128).

The spelling of 21114016 in words is "twenty-one million, one hundred fourteen thousand, sixteen".