21671348 has 12 divisors (see below), whose sum is σ = 38547012. Its totient is φ = 10657920.

The previous prime is 21671347. The next prime is 21671357. The reversal of 21671348 is 84317612.

It can be written as a sum of positive squares in 2 ways, for example, as 4048144 + 17623204 = 2012^2 + 4198^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21671341) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 44165 + ... + 44652.

It is an arithmetic number, because the mean of its divisors is an integer number (3212251).

Almost surely, 2^21671348 is an apocalyptic number.

It is an amenable number.

21671348 is a deficient number, since it is larger than the sum of its proper divisors (16875664).

21671348 is a wasteful number, since it uses less digits than its factorization.

21671348 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88882 (or 88880 counting only the distinct ones).

The product of its digits is 8064, while the sum is 32.

The square root of 21671348 is about 4655.2495099618. The cubic root of 21671348 is about 278.8016301236.

The spelling of 21671348 in words is "twenty-one million, six hundred seventy-one thousand, three hundred forty-eight".