20011010211121 has 4 divisors (see below), whose sum is σ = 21188128458852. Its totient is φ = 18833891963392.

The previous prime is 20011010211119. The next prime is 20011010211139. The reversal of 20011010211121 is 12111201011002.

It is a happy number.

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 12248852026896 + 7762158184225 = 3499836^2 + 2786065^2 .

It is a cyclic number.

It is not a de Polignac number, because 20011010211121 - 2¹ = 20011010211119 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20051010211121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 588559123840 + ... + 588559123873.

It is an arithmetic number, because the mean of its divisors is an integer number (5297032114713).

Almost surely, 2^{20011010211121} is an apocalyptic number.

It is an amenable number.

20011010211121 is a deficient number, since it is larger than the sum of its proper divisors (1177118247731).

20011010211121 is a wasteful number, since it uses less digits than its factorization.

20011010211121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1177118247730.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 20011010211121 its reverse (12111201011002), we get a palindrome (32122211222123).

The spelling of 20011010211121 in words is "twenty trillion, eleven billion, ten million, two hundred eleven thousand, one hundred twenty-one".