21732148 has 12 divisors (see below), whose sum is σ = 39684960. Its totient is φ = 10393592.

The previous prime is 21732131. The next prime is 21732169. The reversal of 21732148 is 84123712.

It is a congruent number.

It is an unprimeable number.

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, 118018 + ... + 118201.

It is an arithmetic number, because the mean of its divisors is an integer number (3307080).

Almost surely, 2^21732148 is an apocalyptic number.

It is an amenable number.

21732148 is a deficient number, since it is larger than the sum of its proper divisors (17952812).

21732148 is a wasteful number, since it uses less digits than its factorization.

21732148 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 236246 (or 236244 counting only the distinct ones).

The product of its digits is 2688, while the sum is 28.

The square root of 21732148 is about 4661.7751983552. The cubic root of 21732148 is about 279.0621170941.

The spelling of 21732148 in words is "twenty-one million, seven hundred thirty-two thousand, one hundred forty-eight".