21835071 has 6 divisors (see below), whose sum is σ = 31539560. Its totient is φ = 14556708.

The previous prime is 21835063. The next prime is 21835087. The reversal of 21835071 is 17053812.

It is not a de Polignac number, because 21835071 - 2³ = 21835063 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 (21835061) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1213051 + ... + 1213068.

Almost surely, 2^21835071 is an apocalyptic number.

21835071 is a deficient number, since it is larger than the sum of its proper divisors (9704489).

21835071 is a wasteful number, since it uses less digits than its factorization.

21835071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2426125 (or 2426122 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 27.

The square root of 21835071 is about 4672.8011941447. The cubic root of 21835071 is about 279.5019675724.

Adding to 21835071 its reverse (17053812), we get a palindrome (38888883).

The spelling of 21835071 in words is "twenty-one million, eight hundred thirty-five thousand, seventy-one".