221101001101 has 4 divisors (see below), whose sum is σ = 224129782012. Its totient is φ = 218072220192.

The previous prime is 221101001087. The next prime is 221101001111. The reversal of 221101001101 is 101100101122.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 101100101122 = 2 ⋅50550050561.

It can be written as a sum of positive squares in 2 ways, for example, as 65395787076 + 155705214025 = 255726^2 + 394595^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221101001101 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221101001111) 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, 1514390346 + ... + 1514390491.

It is an arithmetic number, because the mean of its divisors is an integer number (56032445503).

Almost surely, 2^221101001101 is an apocalyptic number.

It is an amenable number.

221101001101 is a deficient number, since it is larger than the sum of its proper divisors (3028780911).

221101001101 is an equidigital number, since it uses as much as digits as its factorization.

221101001101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3028780910.

The product of its (nonzero) digits is 4, while the sum is 10.

Adding to 221101001101 its reverse (101100101122), we get a palindrome (322201102223).

The spelling of 221101001101 in words is "two hundred twenty-one billion, one hundred one million, one thousand, one hundred one".