20211123221011 has 2 divisors, whose sum is σ = 20211123221012. Its totient is φ = 20211123221010.

The previous prime is 20211123220991. The next prime is 20211123221027. The reversal of 20211123221011 is 11012232111202.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20211123221011 - 2²¹ = 20211121123859 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20211123221011.

It is not a weakly prime, because it can be changed into another prime (20211123221411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10105561610505 + 10105561610506.

It is an arithmetic number, because the mean of its divisors is an integer number (10105561610506).

Almost surely, 2^{20211123221011} is an apocalyptic number.

20211123221011 is a deficient number, since it is larger than the sum of its proper divisors (1).

20211123221011 is an equidigital number, since it uses as much as digits as its factorization.

20211123221011 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96, while the sum is 19.

Adding to 20211123221011 its reverse (11012232111202), we get a palindrome (31223355332213).

The spelling of 20211123221011 in words is "twenty trillion, two hundred eleven billion, one hundred twenty-three million, two hundred twenty-one thousand, eleven".