21346313 has 2 divisors, whose sum is σ = 21346314. Its totient is φ = 21346312.

The previous prime is 21346309. The next prime is 21346343. The reversal of 21346313 is 31364312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12866569 + 8479744 = 3587^2 + 2912^2 .

It is a cyclic number.

It is not a de Polignac number, because 21346313 - 2² = 21346309 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21346343) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10673156 + 10673157.

It is an arithmetic number, because the mean of its divisors is an integer number (10673157).

Almost surely, 2^21346313 is an apocalyptic number.

It is an amenable number.

21346313 is a deficient number, since it is larger than the sum of its proper divisors (1).

21346313 is an equidigital number, since it uses as much as digits as its factorization.

21346313 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1296, while the sum is 23.

The square root of 21346313 is about 4620.2070299934. The cubic root of 21346313 is about 277.4007458256.

The spelling of 21346313 in words is "twenty-one million, three hundred forty-six thousand, three hundred thirteen".