1001200100020 has 96 divisors (see below), whose sum is σ = 2254137984000. Its totient is φ = 372704640000.

The previous prime is 1001200100011. The next prime is 1001200100023. The reversal of 1001200100020 is 200010021001.

It is a junction number, because it is equal to n+sod(n) for n = 1001200099976 and 1001200100012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1001200100023) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4402056 + ... + 4623904.

It is an arithmetic number, because the mean of its divisors is an integer number (23480604000).

Almost surely, 2^{1001200100020} is an apocalyptic number.

1001200100020 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 1001200100020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1127068992000).

1001200100020 is an abundant number, since it is smaller than the sum of its proper divisors (1252937883980).

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

1001200100020 is a wasteful number, since it uses less digits than its factorization.

1001200100020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 222169 (or 222167 counting only the distinct ones).

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

Adding to 1001200100020 its reverse (200010021001), we get a palindrome (1201210121021).

The spelling of 1001200100020 in words is "one trillion, one billion, two hundred million, one hundred thousand, twenty".