2121210005 has 4 divisors (see below), whose sum is σ = 2545452012. Its totient is φ = 1696968000.

The previous prime is 2121209927. The next prime is 2121210011. The reversal of 2121210005 is 5000121212.

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 1457941489 + 663268516 = 38183^2 + 25754^2 .

It is not a de Polignac number, because 2121210005 - 2¹⁴ = 2121193621 is a prime.

It is a super-3 number, since 3×2121210005³ (a number of 29 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 212120996 + ... + 212121005.

It is an arithmetic number, because the mean of its divisors is an integer number (636363003).

Almost surely, 2^2121210005 is an apocalyptic number.

It is an amenable number.

2121210005 is a deficient number, since it is larger than the sum of its proper divisors (424242007).

2121210005 is an equidigital number, since it uses as much as digits as its factorization.

2121210005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 424242006.

The product of its (nonzero) digits is 40, while the sum is 14.

The square root of 2121210005 is about 46056.5956731498. The cubic root of 2121210005 is about 1284.8760154314.

Adding to 2121210005 its reverse (5000121212), we get a palindrome (7121331217).

The spelling of 2121210005 in words is "two billion, one hundred twenty-one million, two hundred ten thousand, five".