21736416 has 48 divisors (see below), whose sum is σ = 61450704. Its totient is φ = 6687744.

The previous prime is 21736397. The next prime is 21736417. The reversal of 21736416 is 61463712.

It is a tau number, because it is divible by the number of its divisors (48).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21736417) 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, 7461 + ... + 9956.

It is an arithmetic number, because the mean of its divisors is an integer number (1280223).

Almost surely, 2^21736416 is an apocalyptic number.

21736416 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

21736416 is an abundant number, since it is smaller than the sum of its proper divisors (39714288).

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

21736416 is a wasteful number, since it uses less digits than its factorization.

21736416 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17443 (or 17435 counting only the distinct ones).

The product of its digits is 6048, while the sum is 30.

The square root of 21736416 is about 4662.2329414134. The cubic root of 21736416 is about 279.0803843351.

The spelling of 21736416 in words is "twenty-one million, seven hundred thirty-six thousand, four hundred sixteen".