221111201101001 has 4 divisors (see below), whose sum is σ = 224735974889604. Its totient is φ = 217486427312400.

The previous prime is 221111201100941. The next prime is 221111201101033. The reversal of 221111201101001 is 100101102111122.

221111201101001 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 97085648772025 + 124025552328976 = 9853205^2 + 11136676^2 .

It is a cyclic number.

It is not a de Polignac number, because 221111201101001 - 2¹⁰ = 221111201099977 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (221111201181001) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1812386894210 + ... + 1812386894331.

It is an arithmetic number, because the mean of its divisors is an integer number (56183993722401).

Almost surely, 2^{221111201101001} is an apocalyptic number.

It is an amenable number.

221111201101001 is a deficient number, since it is larger than the sum of its proper divisors (3624773788603).

221111201101001 is an equidigital number, since it uses as much as digits as its factorization.

221111201101001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3624773788602.

The product of its (nonzero) digits is 8, while the sum is 14.

Adding to 221111201101001 its reverse (100101102111122), we get a palindrome (321212303212123).

The spelling of 221111201101001 in words is "two hundred twenty-one trillion, one hundred eleven billion, two hundred one million, one hundred one thousand, one".