12101100221 has 12 divisors (see below), whose sum is σ = 14078605788. Its totient is φ = 10371033792.

The previous prime is 12101100217. The next prime is 12101100233. The reversal of 12101100221 is 12200110121.

It can be written as a sum of positive squares in 2 ways, for example, as 3394344121 + 8706756100 = 58261^2 + 93310^2 .

It is not a de Polignac number, because 12101100221 - 2² = 12101100217 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 (12101109221) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 644255 + ... + 662771.

It is an arithmetic number, because the mean of its divisors is an integer number (1173217149).

Almost surely, 2^12101100221 is an apocalyptic number.

It is an amenable number.

12101100221 is a deficient number, since it is larger than the sum of its proper divisors (1977505567).

12101100221 is a wasteful number, since it uses less digits than its factorization.

12101100221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31868 (or 31861 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 12101100221 its reverse (12200110121), we get a palindrome (24301210342).

The spelling of 12101100221 in words is "twelve billion, one hundred one million, one hundred thousand, two hundred twenty-one".