20211001211 has 4 divisors (see below), whose sum is σ = 20862969024. Its totient is φ = 19559033400.

The previous prime is 20211001201. The next prime is 20211001243. The reversal of 20211001211 is 11210011202.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20211001211 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20211001192 and 20211001201.

It is not an unprimeable number, because it can be changed into a prime (20211001201) 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, 325983860 + ... + 325983921.

It is an arithmetic number, because the mean of its divisors is an integer number (5215742256).

Almost surely, 2^20211001211 is an apocalyptic number.

20211001211 is a deficient number, since it is larger than the sum of its proper divisors (651967813).

20211001211 is an equidigital number, since it uses as much as digits as its factorization.

20211001211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 651967812.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 20211001211 its reverse (11210011202), we get a palindrome (31421012413).

Subtracting from 20211001211 its reverse (11210011202), we obtain a palindrome (9000990009).

The spelling of 20211001211 in words is "twenty billion, two hundred eleven million, one thousand, two hundred eleven".