20011201011121 has 4 divisors (see below), whose sum is σ = 20021122282852. Its totient is φ = 20001279739392.

The previous prime is 20011201011107. The next prime is 20011201011157. The reversal of 20011201011121 is 12111010211002.

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 18665510529600 + 1345690481521 = 4320360^2 + 1160039^2 .

It is a cyclic number.

It is not a de Polignac number, because 20011201011121 - 2⁷ = 20011201010993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20011201311121) 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, 4960632840 + ... + 4960636873.

It is an arithmetic number, because the mean of its divisors is an integer number (5005280570713).

Almost surely, 2^{20011201011121} is an apocalyptic number.

It is an amenable number.

20011201011121 is a deficient number, since it is larger than the sum of its proper divisors (9921271731).

20011201011121 is an equidigital number, since it uses as much as digits as its factorization.

20011201011121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9921271730.

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

Adding to 20011201011121 its reverse (12111010211002), we get a palindrome (32122211222123).

The spelling of 20011201011121 in words is "twenty trillion, eleven billion, two hundred one million, eleven thousand, one hundred twenty-one".