20111001201 has 12 divisors (see below), whose sum is σ = 29834338612. Its totient is φ = 13044973536.

The previous prime is 20111001187. The next prime is 20111001203. The reversal of 20111001201 is 10210011102.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 12006680625 + 8104320576 = 109575^2 + 90024^2 .

It is not a de Polignac number, because 20111001201 - 2⁶ = 20111001137 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is not an unprimeable number, because it can be changed into a prime (20111001203) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 30196366 + ... + 30197031.

Almost surely, 2^20111001201 is an apocalyptic number.

It is an amenable number.

20111001201 is a deficient number, since it is larger than the sum of its proper divisors (9723337411).

20111001201 is a wasteful number, since it uses less digits than its factorization.

20111001201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60393440 (or 60393437 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

Adding to 20111001201 its reverse (10210011102), we get a palindrome (30321012303).

Subtracting from 20111001201 its reverse (10210011102), we obtain a palindrome (9900990099).

The spelling of 20111001201 in words is "twenty billion, one hundred eleven million, one thousand, two hundred one".