2100001002 has 32 divisors (see below), whose sum is σ = 4616815104. Its totient is φ = 631503600.

The previous prime is 2100000997. The next prime is 2100001021. The reversal of 2100001002 is 2001000012.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (6).

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 15 ways as a sum of consecutive naturals, for example, 112798 + ... + 130089.

It is an arithmetic number, because the mean of its divisors is an integer number (144275472).

Almost surely, 2^2100001002 is an apocalyptic number.

2100001002 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

2100001002 is an abundant number, since it is smaller than the sum of its proper divisors (2516814102).

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

2100001002 is a wasteful number, since it uses less digits than its factorization.

2100001002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 243034.

The product of its (nonzero) digits is 4, while the sum is 6.

The square root of 2100001002 is about 45825.7678822734. The cubic root of 2100001002 is about 1280.5793686605.

Adding to 2100001002 its reverse (2001000012), we get a palindrome (4101001014).

The spelling of 2100001002 in words is "two billion, one hundred million, one thousand, two".