20111201128 has 16 divisors (see below), whose sum is σ = 38132194500. Its totient is φ = 9942615936.

The previous prime is 20111201107. The next prime is 20111201129. The reversal of 20111201128 is 82110211102.

It can be written as a sum of positive squares in 2 ways, for example, as 18642625444 + 1468575684 = 136538^2 + 38322^2 .

It is not an unprimeable number, because it can be changed into a prime (20111201129) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 14122323 + ... + 14123746.

Almost surely, 2^20111201128 is an apocalyptic number.

It is an amenable number.

20111201128 is a deficient number, since it is larger than the sum of its proper divisors (18020993372).

20111201128 is a wasteful number, since it uses less digits than its factorization.

20111201128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28246164 (or 28246160 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 19.

The spelling of 20111201128 in words is "twenty billion, one hundred eleven million, two hundred one thousand, one hundred twenty-eight".