21141447 has 8 divisors (see below), whose sum is σ = 28222320. Its totient is φ = 14077440.

The previous prime is 21141437. The next prime is 21141451. The reversal of 21141447 is 74414112.

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

It is not a de Polignac number, because 21141447 - 2⁴ = 21141431 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21141437) 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 7 ways as a sum of consecutive naturals, for example, 922 + ... + 6567.

It is an arithmetic number, because the mean of its divisors is an integer number (3527790).

Almost surely, 2^21141447 is an apocalyptic number.

21141447 is a deficient number, since it is larger than the sum of its proper divisors (7080873).

21141447 is an equidigital number, since it uses as much as digits as its factorization.

21141447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8433.

The product of its digits is 896, while the sum is 24.

The square root of 21141447 is about 4597.9829273280. The cubic root of 21141447 is about 276.5104631069.

Adding to 21141447 its reverse (74414112), we get a palindrome (95555559).

The spelling of 21141447 in words is "twenty-one million, one hundred forty-one thousand, four hundred forty-seven".