21201345163 has 2 divisors, whose sum is σ = 21201345164. Its totient is φ = 21201345162.

The previous prime is 21201345107. The next prime is 21201345169. The reversal of 21201345163 is 36154310212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21201345163 - 2⁹ = 21201344651 is a prime.

It is not a weakly prime, because it can be changed into another prime (21201345169) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10600672581 + 10600672582.

It is an arithmetic number, because the mean of its divisors is an integer number (10600672582).

Almost surely, 2^21201345163 is an apocalyptic number.

21201345163 is a deficient number, since it is larger than the sum of its proper divisors (1).

21201345163 is an equidigital number, since it uses as much as digits as its factorization.

21201345163 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4320, while the sum is 28.

Adding to 21201345163 its reverse (36154310212), we get a palindrome (57355655375).

The spelling of 21201345163 in words is "twenty-one billion, two hundred one million, three hundred forty-five thousand, one hundred sixty-three".