21683416 has 16 divisors (see below), whose sum is σ = 42058800. Its totient is φ = 10467744.

The previous prime is 21683393. The next prime is 21683419. The reversal of 21683416 is 61438612.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21683419) 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 3 ways as a sum of consecutive naturals, for example, 46500 + ... + 46963.

It is an arithmetic number, because the mean of its divisors is an integer number (2628675).

Almost surely, 2^21683416 is an apocalyptic number.

It is an amenable number.

21683416 is a deficient number, since it is larger than the sum of its proper divisors (20375384).

21683416 is a wasteful number, since it uses less digits than its factorization.

21683416 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93498 (or 93494 counting only the distinct ones).

The product of its digits is 6912, while the sum is 31.

The square root of 21683416 is about 4656.5455006904. The cubic root of 21683416 is about 278.8533720784.

The spelling of 21683416 in words is "twenty-one million, six hundred eighty-three thousand, four hundred sixteen".