12211200128 has 16 divisors (see below), whose sum is σ = 24327000510. Its totient is φ = 6105600000.

The previous prime is 12211200121. The next prime is 12211200161. The reversal of 12211200128 is 82100211221.

It can be written as a sum of positive squares in only one way, i.e., 10880993344 + 1330206784 = 104312^2 + 36472^2 .

It is a tau number, because it is divible by the number of its divisors (16).

It is a super-2 number, since 2×12211200128² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (12211200121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 47699873 + ... + 47700128.

Almost surely, 2^12211200128 is an apocalyptic number.

It is an amenable number.

12211200128 is a deficient number, since it is larger than the sum of its proper divisors (12115800382).

12211200128 is an frugal number, since it uses more digits than its factorization.

12211200128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95400015 (or 95400003 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 12211200128 its reverse (82100211221), we get a palindrome (94311411349).

The spelling of 12211200128 in words is "twelve billion, two hundred eleven million, two hundred thousand, one hundred twenty-eight".