21313220311247 has 2 divisors, whose sum is σ = 21313220311248. Its totient is φ = 21313220311246.

The previous prime is 21313220311231. The next prime is 21313220311333. The reversal of 21313220311247 is 74211302231312.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21313220311247 - 2⁴ = 21313220311231 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21313220311147) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10656610155623 + 10656610155624.

It is an arithmetic number, because the mean of its divisors is an integer number (10656610155624).

Almost surely, 2^{21313220311247} is an apocalyptic number.

21313220311247 is a deficient number, since it is larger than the sum of its proper divisors (1).

21313220311247 is an equidigital number, since it uses as much as digits as its factorization.

21313220311247 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12096, while the sum is 32.

Adding to 21313220311247 its reverse (74211302231312), we get a palindrome (95524522542559).

The spelling of 21313220311247 in words is "twenty-one trillion, three hundred thirteen billion, two hundred twenty million, three hundred eleven thousand, two hundred forty-seven".