21101102011105 has 32 divisors (see below), whose sum is σ = 25586201440800. Its totient is φ = 16704701798400.

The previous prime is 21101102011063. The next prime is 21101102011117. The reversal of 21101102011105 is 50111020110112.

It can be written as a sum of positive squares in 16 ways, for example, as 1009335687649 + 20091766323456 = 1004657^2 + 4482384^2 .

It is not a de Polignac number, because 21101102011105 - 2⁷ = 21101102010977 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3261876811 + ... + 3261883279.

It is an arithmetic number, because the mean of its divisors is an integer number (799568795025).

Almost surely, 2^{21101102011105} is an apocalyptic number.

It is an amenable number.

21101102011105 is a deficient number, since it is larger than the sum of its proper divisors (4485099429695).

21101102011105 is a wasteful number, since it uses less digits than its factorization.

21101102011105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13285.

The product of its (nonzero) digits is 20, while the sum is 16.

Adding to 21101102011105 its reverse (50111020110112), we get a palindrome (71212122121217).

The spelling of 21101102011105 in words is "twenty-one trillion, one hundred one billion, one hundred two million, eleven thousand, one hundred five".