21741616 has 20 divisors (see below), whose sum is σ = 45365152. Its totient is φ = 10034496.

The previous prime is 21741613. The next prime is 21741631. The reversal of 21741616 is 61614712.

It is not an unprimeable number, because it can be changed into a prime (21741613) 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, 52056 + ... + 52471.

Almost surely, 2^21741616 is an apocalyptic number.

21741616 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

21741616 is an abundant number, since it is smaller than the sum of its proper divisors (23623536).

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

21741616 is a wasteful number, since it uses less digits than its factorization.

21741616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104548 (or 104542 counting only the distinct ones).

The product of its digits is 2016, while the sum is 28.

The square root of 21741616 is about 4662.7905807574. The cubic root of 21741616 is about 279.1026373488.

The spelling of 21741616 in words is "twenty-one million, seven hundred forty-one thousand, six hundred sixteen".