20200121110121 has 16 divisors (see below), whose sum is σ = 20949514045200. Its totient is φ = 19454258611200.

The previous prime is 20200121110087. The next prime is 20200121110123. The reversal of 20200121110121 is 12101112100202.

It can be written as a sum of positive squares in 8 ways, for example, as 2746275381721 + 17453845728400 = 1657189^2 + 4177780^2 .

It is a cyclic number.

It is not a de Polignac number, because 20200121110121 - 2²² = 20200116915817 is a prime.

It is a super-2 number, since 2×20200121110121² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20200121110096 and 20200121110105.

It is not an unprimeable number, because it can be changed into a prime (20200121110123) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 156987191 + ... + 157115811.

It is an arithmetic number, because the mean of its divisors is an integer number (1309344627825).

Almost surely, 2^{20200121110121} is an apocalyptic number.

It is an amenable number.

20200121110121 is a deficient number, since it is larger than the sum of its proper divisors (749392935079).

20200121110121 is a wasteful number, since it uses less digits than its factorization.

20200121110121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142300.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 20200121110121 its reverse (12101112100202), we get a palindrome (32301233210323).

The spelling of 20200121110121 in words is "twenty trillion, two hundred billion, one hundred twenty-one million, one hundred ten thousand, one hundred twenty-one".