21320111363 has 2 divisors, whose sum is σ = 21320111364. Its totient is φ = 21320111362.

The previous prime is 21320111291. The next prime is 21320111381. The reversal of 21320111363 is 36311102312.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21320111363 - 2¹² = 21320107267 is a prime.

It is not a weakly prime, because it can be changed into another prime (21320111563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10660055681 + 10660055682.

It is an arithmetic number, because the mean of its divisors is an integer number (10660055682).

Almost surely, 2^21320111363 is an apocalyptic number.

21320111363 is a deficient number, since it is larger than the sum of its proper divisors (1).

21320111363 is an equidigital number, since it uses as much as digits as its factorization.

21320111363 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 648, while the sum is 23.

Adding to 21320111363 its reverse (36311102312), we get a palindrome (57631213675).

The spelling of 21320111363 in words is "twenty-one billion, three hundred twenty million, one hundred eleven thousand, three hundred sixty-three".