20210221101011 has 2 divisors, whose sum is σ = 20210221101012. Its totient is φ = 20210221101010.

The previous prime is 20210221100963. The next prime is 20210221101023. The reversal of 20210221101011 is 11010112201202.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20210221101011 is a prime.

It is not a weakly prime, because it can be changed into another prime (20210221101041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10105110550505 + 10105110550506.

It is an arithmetic number, because the mean of its divisors is an integer number (10105110550506).

Almost surely, 2^{20210221101011} is an apocalyptic number.

20210221101011 is a deficient number, since it is larger than the sum of its proper divisors (1).

20210221101011 is an equidigital number, since it uses as much as digits as its factorization.

20210221101011 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 20210221101011 its reverse (11010112201202), we get a palindrome (31220333302213).

The spelling of 20210221101011 in words is "twenty trillion, two hundred ten billion, two hundred twenty-one million, one hundred one thousand, eleven".