221110110101 has 4 divisors (see below), whose sum is σ = 221816532492. Its totient is φ = 220403687712.

The previous prime is 221110110097. The next prime is 221110110121. The reversal of 221110110101 is 101011011122.

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 21099015025 + 200011095076 = 145255^2 + 447226^2 .

It is a cyclic number.

It is not a de Polignac number, because 221110110101 - 2² = 221110110097 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 (221110110121) 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, 353210726 + ... + 353211351.

It is an arithmetic number, because the mean of its divisors is an integer number (55454133123).

Almost surely, 2^221110110101 is an apocalyptic number.

It is an amenable number.

221110110101 is a deficient number, since it is larger than the sum of its proper divisors (706422391).

221110110101 is an equidigital number, since it uses as much as digits as its factorization.

221110110101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 706422390.

The product of its (nonzero) digits is 4, while the sum is 11.

Adding to 221110110101 its reverse (101011011122), we get a palindrome (322121121223).

The spelling of 221110110101 in words is "two hundred twenty-one billion, one hundred ten million, one hundred ten thousand, one hundred one".