2120001 has 16 divisors (see below), whose sum is σ = 3205440. Its totient is φ = 1235520.

The previous prime is 2119969. The next prime is 2120009. The reversal of 2120001 is 1000212.

It is a happy number.

It is not a de Polignac number, because 2120001 - 2⁵ = 2119969 is a prime.

It is an Ulam number.

2120001 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (2120009) 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 15 ways as a sum of consecutive naturals, for example, 690 + ... + 2171.

It is an arithmetic number, because the mean of its divisors is an integer number (200340).

2^2120001 is an apocalyptic number.

It is an amenable number.

2120001 is a deficient number, since it is larger than the sum of its proper divisors (1085439).

2120001 is a wasteful number, since it uses less digits than its factorization.

2120001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2896.

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

The square root of 2120001 is about 1456.0223212575. The cubic root of 2120001 is about 128.4631859699.

Adding to 2120001 its reverse (1000212), we get a palindrome (3120213).

The spelling of 2120001 in words is "two million, one hundred twenty thousand, one".