1012121321112 has 160 divisors (see below), whose sum is σ = 3093131131200. Its totient is φ = 306650059200.

The previous prime is 1012121321089. The next prime is 1012121321143. The reversal of 1012121321112 is 2111231212101.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 64792839 + ... + 64808457.

It is an arithmetic number, because the mean of its divisors is an integer number (19332069570).

Almost surely, 2^{1012121321112} is an apocalyptic number.

1012121321112 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1012121321112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1546565565600).

1012121321112 is an abundant number, since it is smaller than the sum of its proper divisors (2081009810088).

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

1012121321112 is a wasteful number, since it uses less digits than its factorization.

1012121321112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24739 (or 24726 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 18.

Adding to 1012121321112 its reverse (2111231212101), we get a palindrome (3123352533213).

The spelling of 1012121321112 in words is "one trillion, twelve billion, one hundred twenty-one million, three hundred twenty-one thousand, one hundred twelve".