20110111221001 has 6 divisors (see below), whose sum is σ = 20827475474702. Its totient is φ = 19416659109120.

The previous prime is 20110111220999. The next prime is 20110111221029. The reversal of 20110111221001 is 10012211101102.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 8807100840976 + 11303010380025 = 2967676^2 + 3361995^2 .

It is not a de Polignac number, because 20110111221001 - 2¹ = 20110111220999 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20110111221041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11956070040 + ... + 11956071721.

Almost surely, 2^{20110111221001} is an apocalyptic number.

It is an amenable number.

20110111221001 is a deficient number, since it is larger than the sum of its proper divisors (717364253701).

20110111221001 is an equidigital number, since it uses as much as digits as its factorization.

20110111221001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23912141819 (or 23912141790 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 20110111221001 its reverse (10012211101102), we get a palindrome (30122322322103).

The spelling of 20110111221001 in words is "twenty trillion, one hundred ten billion, one hundred eleven million, two hundred twenty-one thousand, one".