1002100020020 has 72 divisors (see below), whose sum is σ = 2325150823968. Its totient is φ = 359786856000.

The previous prime is 1002100019989. The next prime is 1002100020029. The reversal of 1002100020020 is 200200012001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1002100020029) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 1008095 + ... + 1737945.

It is an arithmetic number, because the mean of its divisors is an integer number (32293761444).

Almost surely, 2^{1002100020020} is an apocalyptic number.

1002100020020 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 1002100020020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1162575411984).

1002100020020 is an abundant number, since it is smaller than the sum of its proper divisors (1323050803948).

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

1002100020020 is a wasteful number, since it uses less digits than its factorization.

1002100020020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 730029 (or 729948 counting only the distinct ones).

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

Adding to 1002100020020 its reverse (200200012001), we get a palindrome (1202300032021).

The spelling of 1002100020020 in words is "one trillion, two billion, one hundred million, twenty thousand, twenty".