21100102231111 has 16 divisors (see below), whose sum is σ = 22354935755040. Its totient is φ = 19846787466240.

The previous prime is 21100102231099. The next prime is 21100102231123. The reversal of 21100102231111 is 11113220100112.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21100102231099) and next prime (21100102231123).

It is a cyclic number.

It is not a de Polignac number, because 21100102231111 - 2⁵ = 21100102231079 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 (21100102235111) 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, 460507075 + ... + 460552891.

It is an arithmetic number, because the mean of its divisors is an integer number (1397183484690).

Almost surely, 2^{21100102231111} is an apocalyptic number.

21100102231111 is a deficient number, since it is larger than the sum of its proper divisors (1254833523929).

21100102231111 is a wasteful number, since it uses less digits than its factorization.

21100102231111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61794.

The product of its (nonzero) digits is 24, while the sum is 16.

Adding to 21100102231111 its reverse (11113220100112), we get a palindrome (32213322331223).

The spelling of 21100102231111 in words is "twenty-one trillion, one hundred billion, one hundred two million, two hundred thirty-one thousand, one hundred eleven".