21344273 has 2 divisors, whose sum is σ = 21344274. Its totient is φ = 21344272.

The previous prime is 21344249. The next prime is 21344311. The reversal of 21344273 is 37244312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17372224 + 3972049 = 4168^2 + 1993^2 .

It is a cyclic number.

It is not a de Polignac number, because 21344273 - 2⁶ = 21344209 is a prime.

It is not a weakly prime, because it can be changed into another prime (21344243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10672136 + 10672137.

It is an arithmetic number, because the mean of its divisors is an integer number (10672137).

Almost surely, 2^21344273 is an apocalyptic number.

It is an amenable number.

21344273 is a deficient number, since it is larger than the sum of its proper divisors (1).

21344273 is an equidigital number, since it uses as much as digits as its factorization.

21344273 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4032, while the sum is 26.

The square root of 21344273 is about 4619.9862553908. The cubic root of 21344273 is about 277.3919087718.

Adding to 21344273 its reverse (37244312), we get a palindrome (58588585).

The spelling of 21344273 in words is "twenty-one million, three hundred forty-four thousand, two hundred seventy-three".