21416772 has 96 divisors (see below), whose sum is σ = 57802752. Its totient is φ = 6120576.

The previous prime is 21416737. The next prime is 21416779. The reversal of 21416772 is 27761412.

It is not an unprimeable number, because it can be changed into a prime (21416779) 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 31 ways as a sum of consecutive naturals, for example, 168573 + ... + 168699.

It is an arithmetic number, because the mean of its divisors is an integer number (602112).

Almost surely, 2^21416772 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 21416772, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28901376).

21416772 is an abundant number, since it is smaller than the sum of its proper divisors (36385980).

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

21416772 is a wasteful number, since it uses less digits than its factorization.

21416772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 217 (or 215 counting only the distinct ones).

The product of its digits is 4704, while the sum is 30.

The square root of 21416772 is about 4627.8258394196. The cubic root of 21416772 is about 277.7056214833.

The spelling of 21416772 in words is "twenty-one million, four hundred sixteen thousand, seven hundred seventy-two".