21450041 has 4 divisors (see below), whose sum is σ = 21470592. Its totient is φ = 21429492.

The previous prime is 21450029. The next prime is 21450061. The reversal of 21450041 is 14005412.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21450041 - 2¹⁸ = 21187897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21450061) 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 3 ways as a sum of consecutive naturals, for example, 8621 + ... + 10826.

It is an arithmetic number, because the mean of its divisors is an integer number (5367648).

Almost surely, 2^21450041 is an apocalyptic number.

It is an amenable number.

21450041 is a deficient number, since it is larger than the sum of its proper divisors (20551).

21450041 is a wasteful number, since it uses less digits than its factorization.

21450041 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20550.

The product of its (nonzero) digits is 160, while the sum is 17.

The square root of 21450041 is about 4631.4188970552. The cubic root of 21450041 is about 277.8493438655.

Adding to 21450041 its reverse (14005412), we get a palindrome (35455453).

The spelling of 21450041 in words is "twenty-one million, four hundred fifty thousand, forty-one".