21448469 has 8 divisors (see below), whose sum is σ = 24589248. Its totient is φ = 18326880.

The previous prime is 21448463. The next prime is 21448477. The reversal of 21448469 is 96484412.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21448469 - 2¹² = 21444373 is a prime.

It is a super-2 number, since 2×21448469² = 920073644887922, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21448463) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2312 + ... + 6945.

It is an arithmetic number, because the mean of its divisors is an integer number (3073656).

Almost surely, 2^21448469 is an apocalyptic number.

It is an amenable number.

21448469 is a deficient number, since it is larger than the sum of its proper divisors (3140779).

21448469 is an equidigital number, since it uses as much as digits as its factorization.

21448469 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9595.

The product of its digits is 55296, while the sum is 38.

The square root of 21448469 is about 4631.2491835357. The cubic root of 21448469 is about 277.8425561576.

The spelling of 21448469 in words is "twenty-one million, four hundred forty-eight thousand, four hundred sixty-nine".