21343373 has 2 divisors, whose sum is σ = 21343374. Its totient is φ = 21343372.

The previous prime is 21343363. The next prime is 21343429. The reversal of 21343373 is 37334312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20268004 + 1075369 = 4502^2 + 1037^2 .

It is a cyclic number.

It is not a de Polignac number, because 21343373 - 2¹² = 21339277 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21343363) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10671686 + 10671687.

It is an arithmetic number, because the mean of its divisors is an integer number (10671687).

Almost surely, 2^21343373 is an apocalyptic number.

It is an amenable number.

21343373 is a deficient number, since it is larger than the sum of its proper divisors (1).

21343373 is an equidigital number, since it uses as much as digits as its factorization.

21343373 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4536, while the sum is 26.

The square root of 21343373 is about 4619.8888514768. Note that the first 4 decimals coincide. The cubic root of 21343373 is about 277.3880098926.

Adding to 21343373 its reverse (37334312), we get a palindrome (58677685).

The spelling of 21343373 in words is "twenty-one million, three hundred forty-three thousand, three hundred seventy-three".