2102001020 has 36 divisors (see below), whose sum is σ = 5134890600. Its totient is φ = 720685728.

The previous prime is 2102001007. The next prime is 2102001029. The reversal of 2102001020 is 201002012.

It is a junction number, because it is equal to n+sod(n) for n = 2102000989 and 2102001007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2102001029) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1071470 + ... + 1073429.

It is an arithmetic number, because the mean of its divisors is an integer number (142635850).

Almost surely, 2^2102001020 is an apocalyptic number.

2102001020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2102001020 is an abundant number, since it is smaller than the sum of its proper divisors (3032889580).

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

2102001020 is a wasteful number, since it uses less digits than its factorization.

2102001020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2144922 (or 2144913 counting only the distinct ones).

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

The square root of 2102001020 is about 45847.5846692059. The cubic root of 2102001020 is about 1280.9857762662.

Adding to 2102001020 its reverse (201002012), we get a palindrome (2303003032).

The spelling of 2102001020 in words is "two billion, one hundred two million, one thousand, twenty".