21703701 has 8 divisors (see below), whose sum is σ = 28969120. Its totient is φ = 14453712.

The previous prime is 21703699. The next prime is 21703709. The reversal of 21703701 is 10730712.

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

It is not a de Polignac number, because 21703701 - 2¹ = 21703699 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21703709) 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 in 7 ways as a sum of consecutive naturals, for example, 31 + ... + 6588.

It is an arithmetic number, because the mean of its divisors is an integer number (3621140).

Almost surely, 2^21703701 is an apocalyptic number.

It is an amenable number.

21703701 is a deficient number, since it is larger than the sum of its proper divisors (7265419).

21703701 is a wasteful number, since it uses less digits than its factorization.

21703701 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7715.

The product of its (nonzero) digits is 294, while the sum is 21.

The square root of 21703701 is about 4658.7231083206. The cubic root of 21703701 is about 278.9403014573.

The spelling of 21703701 in words is "twenty-one million, seven hundred three thousand, seven hundred one".