21710982 has 8 divisors (see below), whose sum is σ = 43421976. Its totient is φ = 7236992.

The previous prime is 21710963. The next prime is 21710993. The reversal of 21710982 is 28901712.

It is a sphenic number, since it is the product of 3 distinct primes.

21710982 is an admirable number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1809243 + ... + 1809254.

It is an arithmetic number, because the mean of its divisors is an integer number (5427747).

Almost surely, 2^21710982 is an apocalyptic number.

21710982 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.

21710982 is a wasteful number, since it uses less digits than its factorization.

21710982 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3618502.

The product of its (nonzero) digits is 2016, while the sum is 30.

The square root of 21710982 is about 4659.5044800923. The cubic root of 21710982 is about 278.9714902588.

The spelling of 21710982 in words is "twenty-one million, seven hundred ten thousand, nine hundred eighty-two".