20110121206 has 16 divisors (see below), whose sum is σ = 34796687616. Its totient is φ = 8538074856.

The previous prime is 20110121179. The next prime is 20110121233. The reversal of 20110121206 is 60212101102.

It is an interprime number because it is at equal distance from previous prime (20110121179) and next prime (20110121233).

It is a self number, because there is not a number n which added to its sum of digits gives 20110121206.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6710826 + ... + 6713821.

It is an arithmetic number, because the mean of its divisors is an integer number (2174792976).

Almost surely, 2^20110121206 is an apocalyptic number.

20110121206 is a deficient number, since it is larger than the sum of its proper divisors (14686566410).

20110121206 is a wasteful number, since it uses less digits than its factorization.

20110121206 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13424763.

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

Adding to 20110121206 its reverse (60212101102), we get a palindrome (80322222308).

The spelling of 20110121206 in words is "twenty billion, one hundred ten million, one hundred twenty-one thousand, two hundred six".