21415416 has 32 divisors (see below), whose sum is σ = 58406400. Its totient is φ = 6489440.

The previous prime is 21415379. The next prime is 21415417. The reversal of 21415416 is 61451412.

It is a happy number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21415417) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40296 + ... + 40823.

It is an arithmetic number, because the mean of its divisors is an integer number (1825200).

Almost surely, 2^21415416 is an apocalyptic number.

It is an amenable number.

21415416 is an abundant number, since it is smaller than the sum of its proper divisors (36990984).

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

21415416 is a wasteful number, since it uses less digits than its factorization.

21415416 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81139 (or 81135 counting only the distinct ones).

The product of its digits is 960, while the sum is 24.

The square root of 21415416 is about 4627.6793320195. The cubic root of 21415416 is about 277.6997603951.

Adding to 21415416 its reverse (61451412), we get a palindrome (82866828).

It can be divided in two parts, 2141 and 5416, that added together give a palindrome (7557).

The spelling of 21415416 in words is "twenty-one million, four hundred fifteen thousand, four hundred sixteen".