12121201128 has 32 divisors (see below), whose sum is σ = 31280520960. Its totient is φ = 3910064640.

The previous prime is 12121201109. The next prime is 12121201129. The reversal of 12121201128 is 82110212121.

It is not an unprimeable number, because it can be changed into a prime (12121201129) 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, 8145225 + ... + 8146712.

It is an arithmetic number, because the mean of its divisors is an integer number (977516280).

Almost surely, 2^12121201128 is an apocalyptic number.

It is an amenable number.

12121201128 is an abundant number, since it is smaller than the sum of its proper divisors (19159319832).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12121201128 is a wasteful number, since it uses less digits than its factorization.

12121201128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16291977 (or 16291973 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 21.

Adding to 12121201128 its reverse (82110212121), we get a palindrome (94231413249).

The spelling of 12121201128 in words is "twelve billion, one hundred twenty-one million, two hundred one thousand, one hundred twenty-eight".