21663163111 has 6 divisors (see below), whose sum is σ = 22645991480. Its totient is φ = 20721285948.

The previous prime is 21663163079. The next prime is 21663163127. The reversal of 21663163111 is 11136136612.

It is not a de Polignac number, because 21663163111 - 2⁵ = 21663163079 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21663163141) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 20475051 + ... + 20476108.

Almost surely, 2^21663163111 is an apocalyptic number.

21663163111 is a deficient number, since it is larger than the sum of its proper divisors (982828369).

21663163111 is an equidigital number, since it uses as much as digits as its factorization.

21663163111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40951205 (or 40951182 counting only the distinct ones).

The product of its digits is 3888, while the sum is 31.

Adding to 21663163111 its reverse (11136136612), we get a palindrome (32799299723).

The spelling of 21663163111 in words is "twenty-one billion, six hundred sixty-three million, one hundred sixty-three thousand, one hundred eleven".