221001220211101 has 6 divisors (see below), whose sum is σ = 242918696595806. Its totient is φ = 200910200191800.

The previous prime is 221001220211053. The next prime is 221001220211173. The reversal of 221001220211101 is 101112022100122.

It can be written as a sum of positive squares in only one way, i.e., 219603798331225 + 1397421879876 = 14819035^2 + 1182126^2 .

It is not a de Polignac number, because 221001220211101 - 2⁷ = 221001220210973 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221001220214101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 913228182570 + ... + 913228182811.

Almost surely, 2^{221001220211101} is an apocalyptic number.

It is an amenable number.

221001220211101 is a deficient number, since it is larger than the sum of its proper divisors (21917476384705).

221001220211101 is a wasteful number, since it uses less digits than its factorization.

221001220211101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1826456365403 (or 1826456365392 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 221001220211101 its reverse (101112022100122), we get a palindrome (322113242311223).

The spelling of 221001220211101 in words is "two hundred twenty-one trillion, one billion, two hundred twenty million, two hundred eleven thousand, one hundred one".