20011231201 has 4 divisors (see below), whose sum is σ = 21550556692. Its totient is φ = 18471905712.

The previous prime is 20011231187. The next prime is 20011231211. The reversal of 20011231201 is 10213211002.

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 4486320400 + 15524910801 = 66980^2 + 124599^2 .

It is not a de Polignac number, because 20011231201 - 2²¹ = 20009134049 is a prime.

It is a super-3 number, since 3×20011231201³ (a number of 32 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (13), and also a Moran number because the ratio is a prime number: 1539325477 = 20011231201 / (2 + 0 + 0 + 1 + 1 + 2 + 3 + 1 + 2 + 0 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20011231211) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 769662726 + ... + 769662751.

It is an arithmetic number, because the mean of its divisors is an integer number (5387639173).

Almost surely, 2^20011231201 is an apocalyptic number.

It is an amenable number.

20011231201 is a deficient number, since it is larger than the sum of its proper divisors (1539325491).

20011231201 is a wasteful number, since it uses less digits than its factorization.

20011231201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1539325490.

The product of its (nonzero) digits is 24, while the sum is 13.

Adding to 20011231201 its reverse (10213211002), we get a palindrome (30224442203).

The spelling of 20011231201 in words is "twenty billion, eleven million, two hundred thirty-one thousand, two hundred one".