21744712 has 16 divisors (see below), whose sum is σ = 44478000. Its totient is φ = 9883920.

The previous prime is 21744631. The next prime is 21744727.

21744712 is nontrivially palindromic in base 10.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 123462 + ... + 123637.

It is an arithmetic number, because the mean of its divisors is an integer number (2779875).

Almost surely, 2^21744712 is an apocalyptic number.

21744712 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21744712 is an abundant number, since it is smaller than the sum of its proper divisors (22733288).

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

21744712 is a wasteful number, since it uses less digits than its factorization.

21744712 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 247116 (or 247112 counting only the distinct ones).

The product of its digits is 3136, while the sum is 28.

The square root of 21744712 is about 4663.1225589727. The cubic root of 21744712 is about 279.1158847657.

It can be divided in two parts, 2174 and 4712, that added together give a palindrome (6886).

The spelling of 21744712 in words is "twenty-one million, seven hundred forty-four thousand, seven hundred twelve".