21682708 has 6 divisors (see below), whose sum is σ = 37944746. Its totient is φ = 10841352.

The previous prime is 21682699. The next prime is 21682709. The reversal of 21682708 is 80728612.

It can be written as a sum of positive squares in only one way, i.e., 21270544 + 412164 = 4612^2 + 642^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21682709) 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 as a sum of consecutive naturals, namely, 2710335 + ... + 2710342.

Almost surely, 2^21682708 is an apocalyptic number.

It is an amenable number.

21682708 is a deficient number, since it is larger than the sum of its proper divisors (16262038).

21682708 is a wasteful number, since it uses less digits than its factorization.

21682708 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5420681 (or 5420679 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 34.

The square root of 21682708 is about 4656.4694780488. The cubic root of 21682708 is about 278.8503370348.

The spelling of 21682708 in words is "twenty-one million, six hundred eighty-two thousand, seven hundred eight".