20111200101 has 10 divisors (see below), whose sum is σ = 30042657062. Its totient is φ = 13407466680.

The previous prime is 20111200099. The next prime is 20111200133. The reversal of 20111200101 is 10100211102.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 19435148100 + 676052001 = 139410^2 + 26001^2 .

It is not a de Polignac number, because 20111200101 - 2¹ = 20111200099 is a prime.

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

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20111200181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 124143130 + ... + 124143291.

Almost surely, 2^20111200101 is an apocalyptic number.

It is an amenable number.

20111200101 is a deficient number, since it is larger than the sum of its proper divisors (9931456961).

20111200101 is an equidigital number, since it uses as much as digits as its factorization.

20111200101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 248286433 (or 248286424 counting only the distinct ones).

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

Adding to 20111200101 its reverse (10100211102), we get a palindrome (30211411203).

The spelling of 20111200101 in words is "twenty billion, one hundred eleven million, two hundred thousand, one hundred one".