20021220211211 has 8 divisors (see below), whose sum is σ = 21328883929920. Its totient is φ = 18738948021192.

The previous prime is 20021220211199. The next prime is 20021220211357. The reversal of 20021220211211 is 11211202212002.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20021220211211 - 2³⁸ = 19746342304267 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20021220211211.

It is not an unprimeable number, because it can be changed into a prime (20021220211511) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6347880545 + ... + 6347883698.

It is an arithmetic number, because the mean of its divisors is an integer number (2666110491240).

Almost surely, 2^{20021220211211} is an apocalyptic number.

20021220211211 is a deficient number, since it is larger than the sum of its proper divisors (1307663718709).

20021220211211 is a wasteful number, since it uses less digits than its factorization.

20021220211211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12695764345.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 20021220211211 its reverse (11211202212002), we get a palindrome (31232422423213).

The spelling of 20021220211211 in words is "twenty trillion, twenty-one billion, two hundred twenty million, two hundred eleven thousand, two hundred eleven".