21416288 has 24 divisors (see below), whose sum is σ = 43525440. Its totient is φ = 10362240.

The previous prime is 21416281. The next prime is 21416321. The reversal of 21416288 is 88261412.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21416281) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9803 + ... + 11786.

It is an arithmetic number, because the mean of its divisors is an integer number (1813560).

Almost surely, 2^21416288 is an apocalyptic number.

It is an amenable number.

21416288 is an abundant number, since it is smaller than the sum of its proper divisors (22109152).

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

21416288 is a wasteful number, since it uses less digits than its factorization.

21416288 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21630 (or 21622 counting only the distinct ones).

The product of its digits is 6144, while the sum is 32.

The square root of 21416288 is about 4627.7735467501. The cubic root of 21416288 is about 277.7035295008.

The spelling of 21416288 in words is "twenty-one million, four hundred sixteen thousand, two hundred eighty-eight".