1000020121000 has 128 divisors (see below), whose sum is σ = 2478354278400. Its totient is φ = 376378291200.

The previous prime is 1000020120989. The next prime is 1000020121033. The reversal of 1000020121000 is 1210200001.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 108234381 + ... + 108243619.

It is an arithmetic number, because the mean of its divisors is an integer number (19362142800).

Almost surely, 2^{1000020121000} is an apocalyptic number.

1000020121000 is a gapful number since it is divisible by the number (10) 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 1000020121000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1239177139200).

1000020121000 is an abundant number, since it is smaller than the sum of its proper divisors (1478334157400).

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

1000020121000 is a wasteful number, since it uses less digits than its factorization.

1000020121000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15644 (or 15630 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 7.

Adding to 1000020121000 its reverse (1210200001), we get a palindrome (1001230321001).

The spelling of 1000020121000 in words is "one trillion, twenty million, one hundred twenty-one thousand".