20130121110 has 128 divisors (see below), whose sum is σ = 53118996480. Its totient is φ = 4841827200.

The previous prime is 20130121021. The next prime is 20130121117. The reversal of 20130121110 is 1112103102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20130121117) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 40997965 + ... + 40998455.

It is an arithmetic number, because the mean of its divisors is an integer number (414992160).

Almost surely, 2^20130121110 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20130121110, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26559498240).

20130121110 is an abundant number, since it is smaller than the sum of its proper divisors (32988875370).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20130121110 is a wasteful number, since it uses less digits than its factorization.

20130121110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1234.

The product of its (nonzero) digits is 12, while the sum is 12.

Adding to 20130121110 its reverse (1112103102), we get a palindrome (21242224212).

The spelling of 20130121110 in words is "twenty billion, one hundred thirty million, one hundred twenty-one thousand, one hundred ten".