20121133201 has 4 divisors (see below), whose sum is σ = 21668912692. Its totient is φ = 18573353712.

The previous prime is 20121133163. The next prime is 20121133237. The reversal of 20121133201 is 10233112102.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 10707282576 + 9413850625 = 103476^2 + 97025^2 .

It is a cyclic number.

It is not a de Polignac number, because 20121133201 - 2¹⁹ = 20120608913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20121133271) 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 in 3 ways as a sum of consecutive naturals, for example, 773889726 + ... + 773889751.

It is an arithmetic number, because the mean of its divisors is an integer number (5417228173).

Almost surely, 2^20121133201 is an apocalyptic number.

It is an amenable number.

20121133201 is a deficient number, since it is larger than the sum of its proper divisors (1547779491).

20121133201 is a wasteful number, since it uses less digits than its factorization.

20121133201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1547779490.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 20121133201 its reverse (10233112102), we get a palindrome (30354245303).

The spelling of 20121133201 in words is "twenty billion, one hundred twenty-one million, one hundred thirty-three thousand, two hundred one".