21597148 has 12 divisors (see below), whose sum is σ = 39784360. Its totient is φ = 10230192.

The previous prime is 21597131. The next prime is 21597179. The reversal of 21597148 is 84179512.

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

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, 142011 + ... + 142162.

Almost surely, 2^21597148 is an apocalyptic number.

It is an amenable number.

21597148 is a deficient number, since it is larger than the sum of its proper divisors (18187212).

21597148 is a wasteful number, since it uses less digits than its factorization.

21597148 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 284196 (or 284194 counting only the distinct ones).

The product of its digits is 20160, while the sum is 37.

The square root of 21597148 is about 4647.2731789728. The cubic root of 21597148 is about 278.4830722445.

The spelling of 21597148 in words is "twenty-one million, five hundred ninety-seven thousand, one hundred forty-eight".