221200120100101 has 4 divisors (see below), whose sum is σ = 221200182269100. Its totient is φ = 221200057931104.

The previous prime is 221200120099993. The next prime is 221200120100107. The reversal of 221200120100101 is 101001021002122.

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 82163619292225 + 139036500807876 = 9064415^2 + 11791374^2 .

It is a cyclic number.

It is not a de Polignac number, because 221200120100101 - 2³³ = 221191530165509 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 (221200120100107) 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, 25401046 + ... + 32978983.

It is an arithmetic number, because the mean of its divisors is an integer number (55300045567275).

Almost surely, 2^{221200120100101} is an apocalyptic number.

It is an amenable number.

221200120100101 is a deficient number, since it is larger than the sum of its proper divisors (62168999).

221200120100101 is an equidigital number, since it uses as much as digits as its factorization.

221200120100101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62168998.

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

Adding to 221200120100101 its reverse (101001021002122), we get a palindrome (322201141102223).

The spelling of 221200120100101 in words is "two hundred twenty-one trillion, two hundred billion, one hundred twenty million, one hundred thousand, one hundred one".