2121201001 has 4 divisors (see below), whose sum is σ = 2125368900. Its totient is φ = 2117033104.

The previous prime is 2121200987. The next prime is 2121201029. The reversal of 2121201001 is 1001021212.

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 604176400 + 1517024601 = 24580^2 + 38949^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2121201001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2121201031) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2083186 + ... + 2084203.

It is an arithmetic number, because the mean of its divisors is an integer number (531342225).

Almost surely, 2^2121201001 is an apocalyptic number.

It is an amenable number.

2121201001 is a deficient number, since it is larger than the sum of its proper divisors (4167899).

2121201001 is an equidigital number, since it uses as much as digits as its factorization.

2121201001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4167898.

The product of its (nonzero) digits is 8, while the sum is 10.

The square root of 2121201001 is about 46056.4979237458. The cubic root of 2121201001 is about 1284.8741974376.

Adding to 2121201001 its reverse (1001021212), we get a palindrome (3122222213).

The spelling of 2121201001 in words is "two billion, one hundred twenty-one million, two hundred one thousand, one".