221100001022101 has 4 divisors (see below), whose sum is σ = 221100053484492. Its totient is φ = 221099948559712.

The previous prime is 221100001022099. The next prime is 221100001022167. The reversal of 221100001022101 is 101220100001122.

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 130816291875025 + 90283709147076 = 11437495^2 + 9501774^2 .

It is a cyclic number.

It is not a de Polignac number, because 221100001022101 - 2¹ = 221100001022099 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 (221100002022101) 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, 19298830 + ... + 28541983.

It is an arithmetic number, because the mean of its divisors is an integer number (55275013371123).

Almost surely, 2^{221100001022101} is an apocalyptic number.

It is an amenable number.

221100001022101 is a deficient number, since it is larger than the sum of its proper divisors (52462391).

221100001022101 is an equidigital number, since it uses as much as digits as its factorization.

221100001022101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52462390.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 221100001022101 its reverse (101220100001122), we get a palindrome (322320101023223).

The spelling of 221100001022101 in words is "two hundred twenty-one trillion, one hundred billion, one million, twenty-two thousand, one hundred one".