21752706 has 16 divisors (see below), whose sum is σ = 43578144. Its totient is φ = 7238784.

The previous prime is 21752699. The next prime is 21752719. The reversal of 21752706 is 60725712.

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 7 ways as a sum of consecutive naturals, for example, 1345 + ... + 6731.

It is an arithmetic number, because the mean of its divisors is an integer number (2723634).

Almost surely, 2^21752706 is an apocalyptic number.

21752706 is an abundant number, since it is smaller than the sum of its proper divisors (21825438).

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

21752706 is a wasteful number, since it uses less digits than its factorization.

21752706 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6065.

The product of its (nonzero) digits is 5880, while the sum is 30.

The square root of 21752706 is about 4663.9796311734. The cubic root of 21752706 is about 279.1500843298.

The spelling of 21752706 in words is "twenty-one million, seven hundred fifty-two thousand, seven hundred six".