20121111030 has 128 divisors (see below), whose sum is σ = 49979151360. Its totient is φ = 5182087680.

The previous prime is 20121111001. The next prime is 20121111061. The reversal of 20121111030 is 3011112102.

It is a junction number, because it is equal to n+sod(n) for n = 20121110997 and 20121111015.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 39530416 + ... + 39530924.

It is an arithmetic number, because the mean of its divisors is an integer number (390462120).

Almost surely, 2^20121111030 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20121111030, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24989575680).

20121111030 is an abundant number, since it is smaller than the sum of its proper divisors (29858040330).

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

20121111030 is a wasteful number, since it uses less digits than its factorization.

20121111030 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 934.

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

Adding to 20121111030 its reverse (3011112102), we get a palindrome (23132223132).

The spelling of 20121111030 in words is "twenty billion, one hundred twenty-one million, one hundred eleven thousand, thirty".