21214449 has 12 divisors (see below), whose sum is σ = 30708496. Its totient is φ = 14112792.

The previous prime is 21214433. The next prime is 21214451. The reversal of 21214449 is 94441212.

It is a happy number.

21214449 is a `hidden beast` number, since 2 + 1 + 214 + 449 = 666.

It is not a de Polignac number, because 21214449 - 2⁴ = 21214433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21214429) 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 11 ways as a sum of consecutive naturals, for example, 2454 + ... + 6960.

Almost surely, 2^21214449 is an apocalyptic number.

It is an amenable number.

21214449 is a deficient number, since it is larger than the sum of its proper divisors (9494047).

21214449 is a wasteful number, since it uses less digits than its factorization.

21214449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5036 (or 5033 counting only the distinct ones).

The product of its digits is 2304, while the sum is 27.

The square root of 21214449 is about 4605.9145671625. The cubic root of 21214449 is about 276.8283635678.

The spelling of 21214449 in words is "twenty-one million, two hundred fourteen thousand, four hundred forty-nine".