21310202201243 has 2 divisors, whose sum is σ = 21310202201244. Its totient is φ = 21310202201242.

The previous prime is 21310202201221. The next prime is 21310202201369. The reversal of 21310202201243 is 34210220201312.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21310202201243 is a prime.

It is not a weakly prime, because it can be changed into another prime (21310202201443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10655101100621 + 10655101100622.

It is an arithmetic number, because the mean of its divisors is an integer number (10655101100622).

Almost surely, 2^{21310202201243} is an apocalyptic number.

21310202201243 is a deficient number, since it is larger than the sum of its proper divisors (1).

21310202201243 is an equidigital number, since it uses as much as digits as its factorization.

21310202201243 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1152, while the sum is 23.

Adding to 21310202201243 its reverse (34210220201312), we get a palindrome (55520422402555).

The spelling of 21310202201243 in words is "twenty-one trillion, three hundred ten billion, two hundred two million, two hundred one thousand, two hundred forty-three".