21834449 has 24 divisors (see below), whose sum is σ = 27655488. Its totient is φ = 17085600.

The previous prime is 21834437. The next prime is 21834451. The reversal of 21834449 is 94443812.

It is not a de Polignac number, because 21834449 - 2⁴ = 21834433 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21834499) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 96074 + ... + 96300.

It is an arithmetic number, because the mean of its divisors is an integer number (1152312).

Almost surely, 2^21834449 is an apocalyptic number.

It is an amenable number.

21834449 is a deficient number, since it is larger than the sum of its proper divisors (5821039).

21834449 is a wasteful number, since it uses less digits than its factorization.

21834449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 405 (or 398 counting only the distinct ones).

The product of its digits is 27648, while the sum is 35.

The square root of 21834449 is about 4672.7346383034. The cubic root of 21834449 is about 279.4993135566.

The spelling of 21834449 in words is "twenty-one million, eight hundred thirty-four thousand, four hundred forty-nine".