23421005 has 4 divisors (see below), whose sum is σ = 28105212. Its totient is φ = 18736800.

The previous prime is 23421001. The next prime is 23421017. The reversal of 23421005 is 50012432.

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 6165289 + 17255716 = 2483^2 + 4154^2 .

It is not a de Polignac number, because 23421005 - 2² = 23421001 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23421001) 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 3 ways as a sum of consecutive naturals, for example, 2342096 + ... + 2342105.

It is an arithmetic number, because the mean of its divisors is an integer number (7026303).

Almost surely, 2^23421005 is an apocalyptic number.

It is an amenable number.

23421005 is a deficient number, since it is larger than the sum of its proper divisors (4684207).

23421005 is an equidigital number, since it uses as much as digits as its factorization.

23421005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4684206.

The product of its (nonzero) digits is 240, while the sum is 17.

The square root of 23421005 is about 4839.5252866371. The cubic root of 23421005 is about 286.1114086639. Note that the first 3 decimals are identical.

Adding to 23421005 its reverse (50012432), we get a palindrome (73433437).

The spelling of 23421005 in words is "twenty-three million, four hundred twenty-one thousand, five".