21450941 has 4 divisors (see below), whose sum is σ = 21907392. Its totient is φ = 20994492.

The previous prime is 21450931. The next prime is 21450959. The reversal of 21450941 is 14905412.

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 a de Polignac number, because none of the positive numbers 2^k-21450941 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21450941.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21450901) 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, 228155 + ... + 228248.

It is an arithmetic number, because the mean of its divisors is an integer number (5476848).

Almost surely, 2^21450941 is an apocalyptic number.

It is an amenable number.

21450941 is a deficient number, since it is larger than the sum of its proper divisors (456451).

21450941 is an equidigital number, since it uses as much as digits as its factorization.

21450941 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 456450.

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 21450941 is about 4631.5160584845. The cubic root of 21450941 is about 277.8532298085.

The spelling of 21450941 in words is "twenty-one million, four hundred fifty thousand, nine hundred forty-one".