221020111212101 has 4 divisors (see below), whose sum is σ = 221041970594304. Its totient is φ = 220998251829900.

The previous prime is 221020111212083. The next prime is 221020111212119. The reversal of 221020111212101 is 101212111020122.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (221020111212083) and next prime (221020111212119).

It is a cyclic number.

It is not a de Polignac number, because 221020111212101 - 2³⁰ = 221019037470277 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 221020111212101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221020117212101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10929675935 + ... + 10929696156.

It is an arithmetic number, because the mean of its divisors is an integer number (55260492648576).

Almost surely, 2^{221020111212101} is an apocalyptic number.

It is an amenable number.

221020111212101 is a deficient number, since it is larger than the sum of its proper divisors (21859382203).

221020111212101 is a wasteful number, since it uses less digits than its factorization.

221020111212101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21859382202.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 221020111212101 its reverse (101212111020122), we get a palindrome (322232222232223).

The spelling of 221020111212101 in words is "two hundred twenty-one trillion, twenty billion, one hundred eleven million, two hundred twelve thousand, one hundred one".