2101001002 has 4 divisors (see below), whose sum is σ = 3151501506. Its totient is φ = 1050500500.

The previous prime is 2101000999. The next prime is 2101001009. The reversal of 2101001002 is 2001001012.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1184667561 + 916333441 = 34419^2 + 30271^2 .

It is not an unprimeable number, because it can be changed into a prime (2101001009) 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 as a sum of consecutive naturals, namely, 525250249 + ... + 525250252.

Almost surely, 2^2101001002 is an apocalyptic number.

2101001002 is a deficient number, since it is larger than the sum of its proper divisors (1050500504).

2101001002 is a wasteful number, since it uses less digits than its factorization.

2101001002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1050500503.

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

The square root of 2101001002 is about 45836.6774755763. The cubic root of 2101001002 is about 1280.7826028740.

Adding to 2101001002 its reverse (2001001012), we get a palindrome (4102002014).

The spelling of 2101001002 in words is "two billion, one hundred one million, one thousand, two".