20101211011 has 16 divisors (see below), whose sum is σ = 23403018240. Its totient is φ = 16909570080.

The previous prime is 20101210993. The next prime is 20101211017. The reversal of 20101211011 is 11011210102.

It is a cyclic number.

It is not a de Polignac number, because 20101211011 - 2⁵ = 20101210979 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20101211017) 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 15 ways as a sum of consecutive naturals, for example, 16480 + ... + 201181.

It is an arithmetic number, because the mean of its divisors is an integer number (1462688640).

Almost surely, 2^20101211011 is an apocalyptic number.

20101211011 is a deficient number, since it is larger than the sum of its proper divisors (3301807229).

20101211011 is a wasteful number, since it uses less digits than its factorization.

20101211011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 217914.

The product of its (nonzero) digits is 4, while the sum is 10.

Adding to 20101211011 its reverse (11011210102), we get a palindrome (31112421113).

Subtracting from 20101211011 its reverse (11011210102), we obtain a palindrome (9090000909).

The spelling of 20101211011 in words is "twenty billion, one hundred one million, two hundred eleven thousand, eleven".