20212811038205 has 4 divisors (see below), whose sum is σ = 24255373245852. Its totient is φ = 16170248830560.

The previous prime is 20212811038187. The next prime is 20212811038237. The reversal of 20212811038205 is 50283011821202.

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 10214940150724 + 9997870887481 = 3196082^2 + 3161941^2 .

It is not a de Polignac number, because 20212811038205 - 2¹⁸ = 20212810776061 is a prime.

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, 2021281103816 + ... + 2021281103825.

It is an arithmetic number, because the mean of its divisors is an integer number (6063843311463).

Almost surely, 2^{20212811038205} is an apocalyptic number.

It is an amenable number.

20212811038205 is a deficient number, since it is larger than the sum of its proper divisors (4042562207647).

20212811038205 is an equidigital number, since it uses as much as digits as its factorization.

20212811038205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4042562207646.

The product of its (nonzero) digits is 15360, while the sum is 35.

Adding to 20212811038205 its reverse (50283011821202), we get a palindrome (70495822859407).

The spelling of 20212811038205 in words is "twenty trillion, two hundred twelve billion, eight hundred eleven million, thirty-eight thousand, two hundred five".