23445421 has 4 divisors (see below), whose sum is σ = 23456412. Its totient is φ = 23434432.

The previous prime is 23445413. The next prime is 23445437. The reversal of 23445421 is 12454432.

It is a happy number.

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 6056521 + 17388900 = 2461^2 + 4170^2 .

It is a cyclic number.

It is not a de Polignac number, because 23445421 - 2³ = 23445413 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 (23445491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1150 + ... + 6943.

It is an arithmetic number, because the mean of its divisors is an integer number (5864103).

Almost surely, 2^23445421 is an apocalyptic number.

It is an amenable number.

23445421 is a deficient number, since it is larger than the sum of its proper divisors (10991).

23445421 is an equidigital number, since it uses as much as digits as its factorization.

23445421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10990.

The product of its digits is 3840, while the sum is 25.

The square root of 23445421 is about 4842.0471910133. The cubic root of 23445421 is about 286.2107962303.

Adding to 23445421 its reverse (12454432), we get a palindrome (35899853).

The spelling of 23445421 in words is "twenty-three million, four hundred forty-five thousand, four hundred twenty-one".