2021210221105 has 4 divisors (see below), whose sum is σ = 2425452265332. Its totient is φ = 1616968176880.

The previous prime is 2021210221091. The next prime is 2021210221159. The reversal of 2021210221105 is 5011220121202.

It is a happy number.

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 1365829303969 + 655380917136 = 1168687^2 + 809556^2 .

It is not a de Polignac number, because 2021210221105 - 2⁵ = 2021210221073 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 202121022106 + ... + 202121022115.

It is an arithmetic number, because the mean of its divisors is an integer number (606363066333).

Almost surely, 2^{2021210221105} is an apocalyptic number.

It is an amenable number.

2021210221105 is a deficient number, since it is larger than the sum of its proper divisors (404242044227).

2021210221105 is an equidigital number, since it uses as much as digits as its factorization.

2021210221105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 404242044226.

The product of its (nonzero) digits is 160, while the sum is 19.

Adding to 2021210221105 its reverse (5011220121202), we get a palindrome (7032430342307).

The spelling of 2021210221105 in words is "two trillion, twenty-one billion, two hundred ten million, two hundred twenty-one thousand, one hundred five".