2101220005 has 4 divisors (see below), whose sum is σ = 2521464012. Its totient is φ = 1680976000.

The previous prime is 2101220003. The next prime is 2101220057. The reversal of 2101220005 is 5000221012.

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 753008481 + 1348211524 = 27441^2 + 36718^2 .

It is not a de Polignac number, because 2101220005 - 2¹ = 2101220003 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2101220003) 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, 210121996 + ... + 210122005.

It is an arithmetic number, because the mean of its divisors is an integer number (630366003).

Almost surely, 2^2101220005 is an apocalyptic number.

It is an amenable number.

2101220005 is a deficient number, since it is larger than the sum of its proper divisors (420244007).

2101220005 is an equidigital number, since it uses as much as digits as its factorization.

2101220005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 420244006.

The product of its (nonzero) digits is 40, while the sum is 13.

The square root of 2101220005 is about 45839.0663626562. The cubic root of 2101220005 is about 1280.8271031680.

Adding to 2101220005 its reverse (5000221012), we get a palindrome (7101441017).

The spelling of 2101220005 in words is "two billion, one hundred one million, two hundred twenty thousand, five".