221021031113101 has 4 divisors (see below), whose sum is σ = 228642445979100. Its totient is φ = 213399616247104.

The previous prime is 221021031113093. The next prime is 221021031113143. The reversal of 221021031113101 is 101311130120122.

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 36853034248900 + 184167996864201 = 6070670^2 + 13570851^2 .

It is a cyclic number.

It is not a de Polignac number, because 221021031113101 - 2³ = 221021031113093 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 (221021031183101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3810707432956 + ... + 3810707433013.

It is an arithmetic number, because the mean of its divisors is an integer number (57160611494775).

Almost surely, 2^{221021031113101} is an apocalyptic number.

It is an amenable number.

221021031113101 is a deficient number, since it is larger than the sum of its proper divisors (7621414865999).

221021031113101 is an equidigital number, since it uses as much as digits as its factorization.

221021031113101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7621414865998.

The product of its (nonzero) digits is 72, while the sum is 19.

Adding to 221021031113101 its reverse (101311130120122), we get a palindrome (322332161233223).

The spelling of 221021031113101 in words is "two hundred twenty-one trillion, twenty-one billion, thirty-one million, one hundred thirteen thousand, one hundred one".