20201220210211 has 4 divisors (see below), whose sum is σ = 20211176456800. Its totient is φ = 20191263963624.

The previous prime is 20201220210203. The next prime is 20201220210217. The reversal of 20201220210211 is 11201202210202.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20201220210211 - 2³ = 20201220210203 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20201220210217) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4978120251 + ... + 4978124308.

It is an arithmetic number, because the mean of its divisors is an integer number (5052794114200).

Almost surely, 2^{20201220210211} is an apocalyptic number.

20201220210211 is a deficient number, since it is larger than the sum of its proper divisors (9956246589).

20201220210211 is an equidigital number, since it uses as much as digits as its factorization.

20201220210211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9956246588.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 20201220210211 its reverse (11201202210202), we get a palindrome (31402422420413).

Subtracting from 20201220210211 its reverse (11201202210202), we obtain a square (9000018000009 = 3000003²).

The spelling of 20201220210211 in words is "twenty trillion, two hundred one billion, two hundred twenty million, two hundred ten thousand, two hundred eleven".