2102221001 has 4 divisors (see below), whose sum is σ = 2102319492. Its totient is φ = 2102122512.

The previous prime is 2102220973. The next prime is 2102221007. The reversal of 2102221001 is 1001222012.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 1190181001 + 912040000 = 34499^2 + 30200^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2102221001 is a prime.

It is a super-3 number, since 3×2102221001³ (a number of 29 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2102221007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2330 + ... + 64883.

It is an arithmetic number, because the mean of its divisors is an integer number (525579873).

Almost surely, 2^2102221001 is an apocalyptic number.

It is an amenable number.

2102221001 is a deficient number, since it is larger than the sum of its proper divisors (98491).

2102221001 is an equidigital number, since it uses as much as digits as its factorization.

2102221001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98490.

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 2102221001 is about 45849.9836532141. The cubic root of 2102221001 is about 1281.0304611006.

Adding to 2102221001 its reverse (1001222012), we get a palindrome (3103443013).

The spelling of 2102221001 in words is "two billion, one hundred two million, two hundred twenty-one thousand, one".