1021000121112 has 96 divisors (see below), whose sum is σ = 2656864551600. Its totient is φ = 326575888128.

The previous prime is 1021000121111. The next prime is 1021000121159. The reversal of 1021000121112 is 2111210001201.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021000121111) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 18464418 + ... + 18519630.

Almost surely, 2^{1021000121112} is an apocalyptic number.

1021000121112 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 1021000121112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1328432275800).

1021000121112 is an abundant number, since it is smaller than the sum of its proper divisors (1635864430488).

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

1021000121112 is a wasteful number, since it uses less digits than its factorization.

1021000121112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55577 (or 55410 counting only the distinct ones).

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

Adding to 1021000121112 its reverse (2111210001201), we get a palindrome (3132210122313).

The spelling of 1021000121112 in words is "one trillion, twenty-one billion, one hundred twenty-one thousand, one hundred twelve".