2100401 has 4 divisors (see below), whose sum is σ = 2223972. Its totient is φ = 1976832.

The previous prime is 2100377. The next prime is 2100403. The reversal of 2100401 is 1040012.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1000000 + 1100401 = 1000^2 + 1049^2 .

It is a cyclic number.

It is not a de Polignac number, because 2100401 - 2¹⁸ = 1838257 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2100403) 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 3 ways as a sum of consecutive naturals, for example, 61760 + ... + 61793.

It is an arithmetic number, because the mean of its divisors is an integer number (555993).

2^2100401 is an apocalyptic number.

It is an amenable number.

2100401 is a deficient number, since it is larger than the sum of its proper divisors (123571).

2100401 is a wasteful number, since it uses less digits than its factorization.

2100401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123570.

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

The square root of 2100401 is about 1449.2760261593. The cubic root of 2100401 is about 128.0660669680.

Adding to 2100401 its reverse (1040012), we get a palindrome (3140413).

The spelling of 2100401 in words is "two million, one hundred thousand, four hundred one".