20211221201011 has 2 divisors, whose sum is σ = 20211221201012. Its totient is φ = 20211221201010.

The previous prime is 20211221200999. The next prime is 20211221201113. The reversal of 20211221201011 is 11010212211202.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20211221201011 - 2¹⁷ = 20211221069939 is a prime.

It is not a weakly prime, because it can be changed into another prime (20211221201411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10105610600505 + 10105610600506.

It is an arithmetic number, because the mean of its divisors is an integer number (10105610600506).

Almost surely, 2^{20211221201011} is an apocalyptic number.

20211221201011 is a deficient number, since it is larger than the sum of its proper divisors (1).

20211221201011 is an equidigital number, since it uses as much as digits as its factorization.

20211221201011 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 16.

Adding to 20211221201011 its reverse (11010212211202), we get a palindrome (31221433412213).

The spelling of 20211221201011 in words is "twenty trillion, two hundred eleven billion, two hundred twenty-one million, two hundred one thousand, eleven".