21237322163 has 2 divisors, whose sum is σ = 21237322164. Its totient is φ = 21237322162.

The previous prime is 21237322129. The next prime is 21237322187. The reversal of 21237322163 is 36122373212.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21237322163 - 2⁸ = 21237321907 is a prime.

It is not a weakly prime, because it can be changed into another prime (21237322363) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10618661081 + 10618661082.

It is an arithmetic number, because the mean of its divisors is an integer number (10618661082).

Almost surely, 2^21237322163 is an apocalyptic number.

21237322163 is a deficient number, since it is larger than the sum of its proper divisors (1).

21237322163 is an equidigital number, since it uses as much as digits as its factorization.

21237322163 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18144, while the sum is 32.

Adding to 21237322163 its reverse (36122373212), we get a palindrome (57359695375).

The spelling of 21237322163 in words is "twenty-one billion, two hundred thirty-seven million, three hundred twenty-two thousand, one hundred sixty-three".