221111201010001 has 4 divisors (see below), whose sum is σ = 221188593802852. Its totient is φ = 221033808217152.

The previous prime is 221111201009969. The next prime is 221111201010041. The reversal of 221111201010001 is 100010102111122.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 80266547905600 + 140844653104401 = 8959160^2 + 11867799^2 .

It is a cyclic number.

It is not a de Polignac number, because 221111201010001 - 2⁵ = 221111201009969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221111201010041) 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 in 3 ways as a sum of consecutive naturals, for example, 38696392140 + ... + 38696397853.

It is an arithmetic number, because the mean of its divisors is an integer number (55297148450713).

Almost surely, 2^{221111201010001} is an apocalyptic number.

It is an amenable number.

221111201010001 is a deficient number, since it is larger than the sum of its proper divisors (77392792851).

221111201010001 is an equidigital number, since it uses as much as digits as its factorization.

221111201010001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77392792850.

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

Adding to 221111201010001 its reverse (100010102111122), we get a palindrome (321121303121123).

The spelling of 221111201010001 in words is "two hundred twenty-one trillion, one hundred eleven billion, two hundred one million, ten thousand, one".