1001003021020 has 12 divisors (see below), whose sum is σ = 2102106344184. Its totient is φ = 400401208400.

The previous prime is 1001003020967. The next prime is 1001003021021. The reversal of 1001003021020 is 201203001001.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a junction number, because it is equal to n+sod(n) for n = 1001003020988 and 1001003021006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1001003021021) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25025075506 + ... + 25025075545.

It is an arithmetic number, because the mean of its divisors is an integer number (175175528682).

Almost surely, 2^{1001003021020} is an apocalyptic number.

1001003021020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1001003021020 is an abundant number, since it is smaller than the sum of its proper divisors (1101103323164).

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

1001003021020 is a wasteful number, since it uses less digits than its factorization.

1001003021020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50050151060 (or 50050151058 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 10.

Adding to 1001003021020 its reverse (201203001001), we get a palindrome (1202206022021).

The spelling of 1001003021020 in words is "one trillion, one billion, three million, twenty-one thousand, twenty".