21313230349 has 2 divisors, whose sum is σ = 21313230350. Its totient is φ = 21313230348.

The previous prime is 21313230283. The next prime is 21313230377. The reversal of 21313230349 is 94303231312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14476421124 + 6836809225 = 120318^2 + 82685^2 .

It is a cyclic number.

It is not a de Polignac number, because 21313230349 - 2⁹ = 21313229837 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21313230349.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21313230649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10656615174 + 10656615175.

It is an arithmetic number, because the mean of its divisors is an integer number (10656615175).

Almost surely, 2^21313230349 is an apocalyptic number.

It is an amenable number.

21313230349 is a deficient number, since it is larger than the sum of its proper divisors (1).

21313230349 is an equidigital number, since it uses as much as digits as its factorization.

21313230349 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11664, while the sum is 31.

The spelling of 21313230349 in words is "twenty-one billion, three hundred thirteen million, two hundred thirty thousand, three hundred forty-nine".