21702716 has 12 divisors (see below), whose sum is σ = 43405488. Its totient is φ = 9301152.

The previous prime is 21702679. The next prime is 21702719. The reversal of 21702716 is 61720712.

21702716 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21702719) by changing a digit.

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, 387521 + ... + 387576.

It is an arithmetic number, because the mean of its divisors is an integer number (3617124).

Almost surely, 2^21702716 is an apocalyptic number.

It is an amenable number.

21702716 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21702716 is a wasteful number, since it uses less digits than its factorization.

21702716 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 775108 (or 775106 counting only the distinct ones).

The product of its (nonzero) digits is 1176, while the sum is 26.

The square root of 21702716 is about 4658.6173914585. The cubic root of 21702716 is about 278.9360815879.

The spelling of 21702716 in words is "twenty-one million, seven hundred two thousand, seven hundred sixteen".