12013122112 has 56 divisors (see below), whose sum is σ = 24589029816. Its totient is φ = 5818871808.

The previous prime is 12013122109. The next prime is 12013122127. The reversal of 12013122112 is 21122131021.

It can be written as a sum of positive squares in 4 ways, for example, as 773729856 + 11239392256 = 27816^2 + 106016^2 .

It is a Harshad number since it is a multiple of its sum of digits (16).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 540858 + ... + 562630.

Almost surely, 2^12013122112 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12013122112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12294514908).

12013122112 is an abundant number, since it is smaller than the sum of its proper divisors (12575907704).

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

12013122112 is a wasteful number, since it uses less digits than its factorization.

12013122112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22055 (or 22045 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 12013122112 its reverse (21122131021), we get a palindrome (33135253133).

The spelling of 12013122112 in words is "twelve billion, thirteen million, one hundred twenty-two thousand, one hundred twelve".