21966041 has 4 divisors (see below), whose sum is σ = 21975732. Its totient is φ = 21956352.

The previous prime is 21966019. The next prime is 21966053. The reversal of 21966041 is 14066912.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 8386816 + 13579225 = 2896^2 + 3685^2 .

It is a cyclic number.

It is not a de Polignac number, because 21966041 - 2¹⁰ = 21965017 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21965995 and 21966013.

It is not an unprimeable number, because it can be changed into a prime (21962041) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 581 + ... + 6653.

It is an arithmetic number, because the mean of its divisors is an integer number (5493933).

Almost surely, 2^21966041 is an apocalyptic number.

It is an amenable number.

21966041 is a deficient number, since it is larger than the sum of its proper divisors (9691).

21966041 is an equidigital number, since it uses as much as digits as its factorization.

21966041 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9690.

The product of its (nonzero) digits is 2592, while the sum is 29.

The square root of 21966041 is about 4686.7943202150. The cubic root of 21966041 is about 280.0596854057.

The spelling of 21966041 in words is "twenty-one million, nine hundred sixty-six thousand, forty-one".