20011201011 has 8 divisors (see below), whose sum is σ = 29646223760. Its totient is φ = 13340800656.

The previous prime is 20011201009. The next prime is 20011201019. The reversal of 20011201011 is 11010211002.

It is a happy number.

It is not a de Polignac number, because 20011201011 - 2¹ = 20011201009 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 junction number, because it is equal to n+sod(n) for n = 20011200984 and 20011201002.

It is not an unprimeable number, because it can be changed into a prime (20011201019) 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 7 ways as a sum of consecutive naturals, for example, 370577770 + ... + 370577823.

It is an arithmetic number, because the mean of its divisors is an integer number (3705777970).

Almost surely, 2^20011201011 is an apocalyptic number.

20011201011 is a deficient number, since it is larger than the sum of its proper divisors (9635022749).

20011201011 is an equidigital number, since it uses as much as digits as its factorization.

20011201011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 741155602 (or 741155596 counting only the distinct ones).

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

Adding to 20011201011 its reverse (11010211002), we get a palindrome (31021412013).

Subtracting from 20011201011 its reverse (11010211002), we obtain a palindrome (9000990009).

The spelling of 20011201011 in words is "twenty billion, eleven million, two hundred one thousand, eleven".