20011010220121 has 4 divisors (see below), whose sum is σ = 20046178955700. Its totient is φ = 19975841484544.

The previous prime is 20011010220119. The next prime is 20011010220193. The reversal of 20011010220121 is 12102201011002.

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 6062010273225 + 13948999946896 = 2462115^2 + 3734836^2 .

It is a cyclic number.

It is not a de Polignac number, because 20011010220121 - 2¹ = 20011010220119 is a prime.

It is a super-2 number, since 2×20011010220121² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20011010220221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17584366936 + ... + 17584368073.

It is an arithmetic number, because the mean of its divisors is an integer number (5011544738925).

Almost surely, 2^{20011010220121} is an apocalyptic number.

It is an amenable number.

20011010220121 is a deficient number, since it is larger than the sum of its proper divisors (35168735579).

20011010220121 is an equidigital number, since it uses as much as digits as its factorization.

20011010220121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35168735578.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 20011010220121 its reverse (12102201011002), we get a palindrome (32113211231123).

The spelling of 20011010220121 in words is "twenty trillion, eleven billion, ten million, two hundred twenty thousand, one hundred twenty-one".