21101102206 has 16 divisors (see below), whose sum is σ = 32847728400. Its totient is φ = 10154184768.

The previous prime is 21101102203. The next prime is 21101102207. The reversal of 21101102206 is 60220110112.

It is a self number, because there is not a number n which added to its sum of digits gives 21101102206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21101102203) 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 7 ways as a sum of consecutive naturals, for example, 563016 + ... + 599323.

It is an arithmetic number, because the mean of its divisors is an integer number (2052983025).

Almost surely, 2^21101102206 is an apocalyptic number.

21101102206 is a deficient number, since it is larger than the sum of its proper divisors (11746626194).

21101102206 is a wasteful number, since it uses less digits than its factorization.

21101102206 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1162683.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 21101102206 its reverse (60220110112), we get a palindrome (81321212318).

The spelling of 21101102206 in words is "twenty-one billion, one hundred one million, one hundred two thousand, two hundred six".