20001110121 has 12 divisors (see below), whose sum is σ = 28914970500. Its totient is φ = 13322775840.

The previous prime is 20001110119. The next prime is 20001110149. The reversal of 20001110121 is 12101110002.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 16260075225 + 3741034896 = 127515^2 + 61164^2 .

It is not a de Polignac number, because 20001110121 - 2¹ = 20001110119 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is not an unprimeable number, because it can be changed into a prime (20001110221) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 930246 + ... + 951503.

It is an arithmetic number, because the mean of its divisors is an integer number (2409580875).

Almost surely, 2^20001110121 is an apocalyptic number.

It is an amenable number.

20001110121 is a deficient number, since it is larger than the sum of its proper divisors (8913860379).

20001110121 is a wasteful number, since it uses less digits than its factorization.

20001110121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1882936 (or 1882933 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

Adding to 20001110121 its reverse (12101110002), we get a palindrome (32102220123).

The spelling of 20001110121 in words is "twenty billion, one million, one hundred ten thousand, one hundred twenty-one".