21103132111 has 16 divisors (see below), whose sum is σ = 21429805824. Its totient is φ = 20779041024.

The previous prime is 21103132079. The next prime is 21103132139. The reversal of 21103132111 is 11123130112.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21103132111 - 2⁵ = 21103132079 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 (21103832111) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25517280 + ... + 25518106.

It is an arithmetic number, because the mean of its divisors is an integer number (1339362864).

Almost surely, 2^21103132111 is an apocalyptic number.

21103132111 is a deficient number, since it is larger than the sum of its proper divisors (326673713).

21103132111 is an equidigital number, since it uses as much as digits as its factorization.

21103132111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1950.

The product of its (nonzero) digits is 36, while the sum is 16.

Adding to 21103132111 its reverse (11123130112), we get a palindrome (32226262223).

The spelling of 21103132111 in words is "twenty-one billion, one hundred three million, one hundred thirty-two thousand, one hundred eleven".