21457348 has 24 divisors (see below), whose sum is σ = 41489280. Its totient is φ = 9628320.

The previous prime is 21457339. The next prime is 21457379. The reversal of 21457348 is 84375412.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 390 + ... + 6562.

It is an arithmetic number, because the mean of its divisors is an integer number (1728720).

Almost surely, 2^21457348 is an apocalyptic number.

It is an amenable number.

21457348 is a deficient number, since it is larger than the sum of its proper divisors (20031932).

21457348 is a wasteful number, since it uses less digits than its factorization.

21457348 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6267 (or 6265 counting only the distinct ones).

The product of its digits is 26880, while the sum is 34.

The square root of 21457348 is about 4632.2076810091. The cubic root of 21457348 is about 277.8808902646.

The spelling of 21457348 in words is "twenty-one million, four hundred fifty-seven thousand, three hundred forty-eight".