21448347 has 4 divisors (see below), whose sum is σ = 28597800. Its totient is φ = 14298896.

The previous prime is 21448337. The next prime is 21448379. The reversal of 21448347 is 74384412.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21448347 - 2⁴ = 21448331 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21448307) 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, 3574722 + ... + 3574727.

It is an arithmetic number, because the mean of its divisors is an integer number (7149450).

Almost surely, 2^21448347 is an apocalyptic number.

21448347 is a deficient number, since it is larger than the sum of its proper divisors (7149453).

21448347 is an equidigital number, since it uses as much as digits as its factorization.

21448347 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7149452.

The product of its digits is 21504, while the sum is 33.

The square root of 21448347 is about 4631.2360121246. The cubic root of 21448347 is about 277.8420293623.

The spelling of 21448347 in words is "twenty-one million, four hundred forty-eight thousand, three hundred forty-seven".