20121201191 has 48 divisors (see below), whose sum is σ = 26578188000. Its totient is φ = 15056762112.

The previous prime is 20121201187. The next prime is 20121201197. The reversal of 20121201191 is 19110212102.

It is not a de Polignac number, because 20121201191 - 2² = 20121201187 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20121201197) 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 47 ways as a sum of consecutive naturals, for example, 10322885 + ... + 10324833.

It is an arithmetic number, because the mean of its divisors is an integer number (553712250).

Almost surely, 2^20121201191 is an apocalyptic number.

20121201191 is a deficient number, since it is larger than the sum of its proper divisors (6456986809).

20121201191 is a wasteful number, since it uses less digits than its factorization.

20121201191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2848 (or 2841 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 20.

Adding to 20121201191 its reverse (19110212102), we get a palindrome (39231413293).

It can be divided in two parts, 201212011 and 91, that added together give a palindrome (201212102).

The spelling of 20121201191 in words is "twenty billion, one hundred twenty-one million, two hundred one thousand, one hundred ninety-one".