2101001 has 8 divisors (see below), whose sum is σ = 2527680. Its totient is φ = 1705968.

The previous prime is 2100997. The next prime is 2101003. The reversal of 2101001 is 1001012.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2101001 - 2² = 2100997 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2101003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7766 + ... + 8031.

It is an arithmetic number, because the mean of its divisors is an integer number (315960).

2^2101001 is an apocalyptic number.

It is an amenable number.

2101001 is a deficient number, since it is larger than the sum of its proper divisors (426679).

2101001 is a wasteful number, since it uses less digits than its factorization.

2101001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15823.

The product of its (nonzero) digits is 2, while the sum is 5.

The square root of 2101001 is about 1449.4830112837. The cubic root of 2101001 is about 128.0782602468.

Adding to 2101001 its reverse (1001012), we get a palindrome (3102013).

Multiplying 2101001 by its reverse (1001012), we get a palindrome (2103127213012).

The spelling of 2101001 in words is "two million, one hundred one thousand, one".