21438441 has 12 divisors (see below), whose sum is σ = 32596720. Its totient is φ = 13539960.

The previous prime is 21438433. The next prime is 21438451. The reversal of 21438441 is 14483412.

21438441 is a `hidden beast` number, since 214 + 3 + 8 + 441 = 666.

It is not a de Polignac number, because 21438441 - 2³ = 21438433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21438401) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 62515 + ... + 62856.

Almost surely, 2^21438441 is an apocalyptic number.

It is an amenable number.

21438441 is a deficient number, since it is larger than the sum of its proper divisors (11158279).

21438441 is a wasteful number, since it uses less digits than its factorization.

21438441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125396 (or 125393 counting only the distinct ones).

The product of its digits is 3072, while the sum is 27.

The square root of 21438441 is about 4630.1664116962. The cubic root of 21438441 is about 277.7992486455.

The spelling of 21438441 in words is "twenty-one million, four hundred thirty-eight thousand, four hundred forty-one".