20210212105 has 4 divisors (see below), whose sum is σ = 24252254532. Its totient is φ = 16168169680.

The previous prime is 20210212097. The next prime is 20210212117. The reversal of 20210212105 is 50121201202.

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 9326923776 + 10883288329 = 96576^2 + 104323^2 .

It is not a de Polignac number, because 20210212105 - 2³ = 20210212097 is a prime.

It is a Duffinian 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, 2021021206 + ... + 2021021215.

It is an arithmetic number, because the mean of its divisors is an integer number (6063063633).

Almost surely, 2^20210212105 is an apocalyptic number.

It is an amenable number.

20210212105 is a deficient number, since it is larger than the sum of its proper divisors (4042042427).

20210212105 is an equidigital number, since it uses as much as digits as its factorization.

20210212105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4042042426.

The product of its (nonzero) digits is 80, while the sum is 16.

Adding to 20210212105 its reverse (50121201202), we get a palindrome (70331413307).

The spelling of 20210212105 in words is "twenty billion, two hundred ten million, two hundred twelve thousand, one hundred five".