21144323 has 2 divisors, whose sum is σ = 21144324. Its totient is φ = 21144322.

The previous prime is 21144307. The next prime is 21144341. The reversal of 21144323 is 32344112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21144323 - 2⁴ = 21144307 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21144295 and 21144304.

It is not a weakly prime, because it can be changed into another prime (21144373) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10572161 + 10572162.

It is an arithmetic number, because the mean of its divisors is an integer number (10572162).

Almost surely, 2^21144323 is an apocalyptic number.

21144323 is a deficient number, since it is larger than the sum of its proper divisors (1).

21144323 is an equidigital number, since it uses as much as digits as its factorization.

21144323 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 576, while the sum is 20.

The square root of 21144323 is about 4598.2956625254. The cubic root of 21144323 is about 276.5230010067.

Adding to 21144323 its reverse (32344112), we get a palindrome (53488435).

The spelling of 21144323 in words is "twenty-one million, one hundred forty-four thousand, three hundred twenty-three".