21163001111 has 48 divisors (see below), whose sum is σ = 26073441600. Its totient is φ = 16794376704.

The previous prime is 21163001107. The next prime is 21163001113. The reversal of 21163001111 is 11110036112.

It is not a de Polignac number, because 21163001111 - 2² = 21163001107 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21163001111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21163001113) 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 in 47 ways as a sum of consecutive naturals, for example, 51743075 + ... + 51743483.

It is an arithmetic number, because the mean of its divisors is an integer number (543196700).

Almost surely, 2^21163001111 is an apocalyptic number.

21163001111 is a deficient number, since it is larger than the sum of its proper divisors (4910440489).

21163001111 is an equidigital number, since it uses as much as digits as its factorization.

21163001111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 648 (or 565 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 17.

Adding to 21163001111 its reverse (11110036112), we get a palindrome (32273037223).

The spelling of 21163001111 in words is "twenty-one billion, one hundred sixty-three million, one thousand, one hundred eleven".