20212004105 has 4 divisors (see below), whose sum is σ = 24254404932. Its totient is φ = 16169603280.

The previous prime is 20212004063. The next prime is 20212004173. The reversal of 20212004105 is 50140021202.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50140021202 = 2 ⋅25070010601.

It can be written as a sum of positive squares in 2 ways, for example, as 6843094729 + 13368909376 = 82723^2 + 115624^2 .

It is a de Polignac number, because none of the positive numbers 2^k-20212004105 is a prime.

It is a super-3 number, since 3×20212004105³ (a number of 32 digits) contains 333 as substring.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

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, 2021200406 + ... + 2021200415.

It is an arithmetic number, because the mean of its divisors is an integer number (6063601233).

Almost surely, 2^20212004105 is an apocalyptic number.

It is an amenable number.

20212004105 is a deficient number, since it is larger than the sum of its proper divisors (4042400827).

20212004105 is an equidigital number, since it uses as much as digits as its factorization.

20212004105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4042400826.

The product of its (nonzero) digits is 160, while the sum is 17.

Adding to 20212004105 its reverse (50140021202), we get a palindrome (70352025307).

The spelling of 20212004105 in words is "twenty billion, two hundred twelve million, four thousand, one hundred five".