221220200101 has 4 divisors (see below), whose sum is σ = 221654817900. Its totient is φ = 220785582304.

The previous prime is 221220200093. The next prime is 221220200107. The reversal of 221220200101 is 101002022122.

It is a happy number.

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 94647907201 + 126572292900 = 307649^2 + 355770^2 .

It is a cyclic number.

It is not a de Polignac number, because 221220200101 - 2³ = 221220200093 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 (221220200107) 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, 217308136 + ... + 217309153.

It is an arithmetic number, because the mean of its divisors is an integer number (55413704475).

Almost surely, 2^221220200101 is an apocalyptic number.

It is an amenable number.

221220200101 is a deficient number, since it is larger than the sum of its proper divisors (434617799).

221220200101 is an equidigital number, since it uses as much as digits as its factorization.

221220200101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 434617798.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 221220200101 its reverse (101002022122), we get a palindrome (322222222223).

The spelling of 221220200101 in words is "two hundred twenty-one billion, two hundred twenty million, two hundred thousand, one hundred one".