21571041 has 8 divisors (see below), whose sum is σ = 29753280. Its totient is φ = 13884752.

The previous prime is 21571001. The next prime is 21571051. The reversal of 21571041 is 14017512.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 21571041 - 2¹⁷ = 21439969 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21570999 and 21571017.

It is not an unprimeable number, because it can be changed into a prime (21571001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 123885 + ... + 124058.

It is an arithmetic number, because the mean of its divisors is an integer number (3719160).

Almost surely, 2^21571041 is an apocalyptic number.

It is an amenable number.

21571041 is a deficient number, since it is larger than the sum of its proper divisors (8182239).

21571041 is a wasteful number, since it uses less digits than its factorization.

21571041 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 247975.

The product of its (nonzero) digits is 280, while the sum is 21.

The square root of 21571041 is about 4644.4634781641. The cubic root of 21571041 is about 278.3708153075.

Adding to 21571041 its reverse (14017512), we get a palindrome (35588553).

The spelling of 21571041 in words is "twenty-one million, five hundred seventy-one thousand, forty-one".