21626041 has 4 divisors (see below), whose sum is σ = 21703284. Its totient is φ = 21548800.

The previous prime is 21626039. The next prime is 21626051. The reversal of 21626041 is 14062612.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7155625 + 14470416 = 2675^2 + 3804^2 .

It is a cyclic number.

It is not a de Polignac number, because 21626041 - 2¹ = 21626039 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21626051) 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, 38200 + ... + 38761.

It is an arithmetic number, because the mean of its divisors is an integer number (5425821).

Almost surely, 2^21626041 is an apocalyptic number.

It is an amenable number.

21626041 is a deficient number, since it is larger than the sum of its proper divisors (77243).

21626041 is an equidigital number, since it uses as much as digits as its factorization.

21626041 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77242.

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 21626041 is about 4650.3807371010. The cubic root of 21626041 is about 278.6072032325.

Adding to 21626041 its reverse (14062612), we get a palindrome (35688653).

The spelling of 21626041 in words is "twenty-one million, six hundred twenty-six thousand, forty-one".