21341273 has 8 divisors (see below), whose sum is σ = 22694760. Its totient is φ = 19998720.

The previous prime is 21341249. The next prime is 21341317. The reversal of 21341273 is 37214312.

It can be written as a sum of positive squares in 4 ways, for example, as 15031129 + 6310144 = 3877^2 + 2512^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21341273 - 2⁸ = 21341017 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21341773) 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 7 ways as a sum of consecutive naturals, for example, 1493 + ... + 6701.

It is an arithmetic number, because the mean of its divisors is an integer number (2836845).

Almost surely, 2^21341273 is an apocalyptic number.

It is an amenable number.

21341273 is a deficient number, since it is larger than the sum of its proper divisors (1353487).

21341273 is a wasteful number, since it uses less digits than its factorization.

21341273 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5467.

The product of its digits is 1008, while the sum is 23.

The square root of 21341273 is about 4619.6615676909. The cubic root of 21341273 is about 277.3789120815.

Adding to 21341273 its reverse (37214312), we get a palindrome (58555585).

The spelling of 21341273 in words is "twenty-one million, three hundred forty-one thousand, two hundred seventy-three".