21232071 has 16 divisors (see below), whose sum is σ = 35948800. Its totient is φ = 12132504.

The previous prime is 21232049. The next prime is 21232073. The reversal of 21232071 is 17023212.

It is not a de Polignac number, because 21232071 - 2⁶ = 21232007 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 (21232073) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 55981 + ... + 56358.

It is an arithmetic number, because the mean of its divisors is an integer number (2246800).

Almost surely, 2^21232071 is an apocalyptic number.

21232071 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

21232071 is a deficient number, since it is larger than the sum of its proper divisors (14716729).

21232071 is a wasteful number, since it uses less digits than its factorization.

21232071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112355 (or 112349 counting only the distinct ones).

The product of its (nonzero) digits is 168, while the sum is 18.

The square root of 21232071 is about 4607.8271451954. The cubic root of 21232071 is about 276.9049924622.

Adding to 21232071 its reverse (17023212), we get a palindrome (38255283).

The spelling of 21232071 in words is "twenty-one million, two hundred thirty-two thousand, seventy-one".