20211121021211 has 2 divisors, whose sum is σ = 20211121021212. Its totient is φ = 20211121021210.

The previous prime is 20211121021207. The next prime is 20211121021283. The reversal of 20211121021211 is 11212012111202.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20211121021211 - 2² = 20211121021207 is a prime.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20211121021211.

It is not a weakly prime, because it can be changed into another prime (20211121027211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10105560510605 + 10105560510606.

It is an arithmetic number, because the mean of its divisors is an integer number (10105560510606).

Almost surely, 2^{20211121021211} is an apocalyptic number.

20211121021211 is a deficient number, since it is larger than the sum of its proper divisors (1).

20211121021211 is an equidigital number, since it uses as much as digits as its factorization.

20211121021211 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 20211121021211 its reverse (11212012111202), we get a palindrome (31423133132413).

The spelling of 20211121021211 in words is "twenty trillion, two hundred eleven billion, one hundred twenty-one million, twenty-one thousand, two hundred eleven".