2101801 has 8 divisors (see below), whose sum is σ = 2286144. Its totient is φ = 1920720.

The previous prime is 2101789. The next prime is 2101807. The reversal of 2101801 is 1081012.

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 2101801 - 2¹⁷ = 1970729 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2101807) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 636 + ... + 2146.

It is an arithmetic number, because the mean of its divisors is an integer number (285768).

2^2101801 is an apocalyptic number.

It is an amenable number.

2101801 is a deficient number, since it is larger than the sum of its proper divisors (184343).

2101801 is a wasteful number, since it uses less digits than its factorization.

2101801 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1631.

The product of its (nonzero) digits is 16, while the sum is 13.

The square root of 2101801 is about 1449.7589454802. The cubic root of 2101801 is about 128.0945143412.

Adding to 2101801 its reverse (1081012), we get a palindrome (3182813).

The spelling of 2101801 in words is "two million, one hundred one thousand, eight hundred one".