21641448 has 32 divisors (see below), whose sum is σ = 55568160. Its totient is φ = 7018560.

The previous prime is 21641393. The next prime is 21641467. The reversal of 21641448 is 84414612.

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11298 + ... + 13073.

It is an arithmetic number, because the mean of its divisors is an integer number (1736505).

Almost surely, 2^21641448 is an apocalyptic number.

It is an amenable number.

21641448 is an abundant number, since it is smaller than the sum of its proper divisors (33926712).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21641448 is a wasteful number, since it uses less digits than its factorization.

21641448 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24417 (or 24413 counting only the distinct ones).

The product of its digits is 6144, while the sum is 30.

The square root of 21641448 is about 4652.0369731979. The cubic root of 21641448 is about 278.6733500632.

The spelling of 21641448 in words is "twenty-one million, six hundred forty-one thousand, four hundred forty-eight".