21971703 has 8 divisors (see below), whose sum is σ = 31549168. Its totient is φ = 13521024.

The previous prime is 21971687. The next prime is 21971707. The reversal of 21971703 is 30717912.

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

It is not a de Polignac number, because 21971703 - 2⁴ = 21971687 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 (21971707) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 281650 + ... + 281727.

It is an arithmetic number, because the mean of its divisors is an integer number (3943646).

Almost surely, 2^21971703 is an apocalyptic number.

21971703 is a deficient number, since it is larger than the sum of its proper divisors (9577465).

21971703 is a wasteful number, since it uses less digits than its factorization.

21971703 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 563393.

The product of its (nonzero) digits is 2646, while the sum is 30.

The square root of 21971703 is about 4687.3983188972. The cubic root of 21971703 is about 280.0837462081.

The spelling of 21971703 in words is "twenty-one million, nine hundred seventy-one thousand, seven hundred three".