1001020121112 has 128 divisors (see below), whose sum is σ = 2894169346560. Its totient is φ = 285147985920.

The previous prime is 1001020121093. The next prime is 1001020121137. The reversal of 1001020121112 is 2111210201001.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3558118 + ... + 3829130.

It is an arithmetic number, because the mean of its divisors is an integer number (22610698020).

Almost surely, 2^{1001020121112} is an apocalyptic number.

1001020121112 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 1001020121112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1447084673280).

1001020121112 is an abundant number, since it is smaller than the sum of its proper divisors (1893149225448).

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

1001020121112 is a wasteful number, since it uses less digits than its factorization.

1001020121112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 271873 (or 271869 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 1001020121112 its reverse (2111210201001), we get a palindrome (3112230322113).

The spelling of 1001020121112 in words is "one trillion, one billion, twenty million, one hundred twenty-one thousand, one hundred twelve".