20011102221001 has 2 divisors, whose sum is σ = 20011102221002. Its totient is φ = 20011102221000.

The previous prime is 20011102220999. The next prime is 20011102221013. The reversal of 20011102221001 is 10012220111002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11547797222025 + 8463304998976 = 3398205^2 + 2909176^2 .

It is a cyclic number.

It is not a de Polignac number, because 20011102221001 - 2¹ = 20011102220999 is a prime.

Together with 20011102220999, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (20011102221031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10005551110500 + 10005551110501.

It is an arithmetic number, because the mean of its divisors is an integer number (10005551110501).

Almost surely, 2^{20011102221001} is an apocalyptic number.

It is an amenable number.

20011102221001 is a deficient number, since it is larger than the sum of its proper divisors (1).

20011102221001 is an equidigital number, since it uses as much as digits as its factorization.

20011102221001 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 13.

Adding to 20011102221001 its reverse (10012220111002), we get a palindrome (30023322332003).

The spelling of 20011102221001 in words is "twenty trillion, eleven billion, one hundred two million, two hundred twenty-one thousand, one".