21482449 has 4 divisors (see below), whose sum is σ = 21526000. Its totient is φ = 21438900.

The previous prime is 21482387. The next prime is 21482491. The reversal of 21482449 is 94428412.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21482449 - 2²³ = 13093841 is a prime.

It is a super-2 number, since 2×21482449² = 922991230075202, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21486449) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21027 + ... + 22024.

It is an arithmetic number, because the mean of its divisors is an integer number (5381500).

Almost surely, 2^21482449 is an apocalyptic number.

It is an amenable number.

21482449 is a deficient number, since it is larger than the sum of its proper divisors (43551).

21482449 is an equidigital number, since it uses as much as digits as its factorization.

21482449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43550.

The product of its digits is 18432, while the sum is 34.

The square root of 21482449 is about 4634.9162883487. The cubic root of 21482449 is about 277.9892039007.

The spelling of 21482449 in words is "twenty-one million, four hundred eighty-two thousand, four hundred forty-nine".