21344369 has 2 divisors, whose sum is σ = 21344370. Its totient is φ = 21344368.

The previous prime is 21344357. The next prime is 21344417. The reversal of 21344369 is 96344312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10975969 + 10368400 = 3313^2 + 3220^2 .

It is a cyclic number.

It is not a de Polignac number, because 21344369 - 2¹² = 21340273 is a prime.

It is a super-2 number, since 2×21344369² = 911164176016322, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21344339) 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 as a sum of consecutive naturals, namely, 10672184 + 10672185.

It is an arithmetic number, because the mean of its divisors is an integer number (10672185).

Almost surely, 2^21344369 is an apocalyptic number.

It is an amenable number.

21344369 is a deficient number, since it is larger than the sum of its proper divisors (1).

21344369 is an equidigital number, since it uses as much as digits as its factorization.

21344369 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15552, while the sum is 32.

The square root of 21344369 is about 4619.9966450204. The cubic root of 21344369 is about 277.3923246458.

The spelling of 21344369 in words is "twenty-one million, three hundred forty-four thousand, three hundred sixty-nine".