21716982 has 24 divisors (see below), whose sum is σ = 53775696. Its totient is φ = 6204816.

The previous prime is 21716977. The next prime is 21716999. The reversal of 21716982 is 28961712.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 86053 + ... + 86304.

It is an arithmetic number, because the mean of its divisors is an integer number (2240654).

Almost surely, 2^21716982 is an apocalyptic number.

21716982 is an abundant number, since it is smaller than the sum of its proper divisors (32058714).

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

21716982 is a wasteful number, since it uses less digits than its factorization.

21716982 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172372 (or 172369 counting only the distinct ones).

The product of its digits is 12096, while the sum is 36.

The square root of 21716982 is about 4660.1482809027. The cubic root of 21716982 is about 278.9971865443.

It can be divided in two parts, 21 and 716982, that added together give a triangular number (717003 = T₁₁₉₇).

The spelling of 21716982 in words is "twenty-one million, seven hundred sixteen thousand, nine hundred eighty-two".