21740708 has 12 divisors (see below), whose sum is σ = 41505072. Its totient is φ = 9882120.

The previous prime is 21740687. The next prime is 21740711. The reversal of 21740708 is 80704712.

It is a hoax number, since the sum of its digits (29) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

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, 247010 + ... + 247097.

It is an arithmetic number, because the mean of its divisors is an integer number (3458756).

Almost surely, 2^21740708 is an apocalyptic number.

It is an amenable number.

21740708 is a deficient number, since it is larger than the sum of its proper divisors (19764364).

21740708 is a wasteful number, since it uses less digits than its factorization.

21740708 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 494122 (or 494120 counting only the distinct ones).

The product of its (nonzero) digits is 3136, while the sum is 29.

The square root of 21740708 is about 4662.6932131548. The cubic root of 21740708 is about 279.0987518860.

The spelling of 21740708 in words is "twenty-one million, seven hundred forty thousand, seven hundred eight".