221220102002101 has 4 divisors (see below), whose sum is σ = 221259124781100. Its totient is φ = 221181079223104.

The previous prime is 221220102002099. The next prime is 221220102002167. The reversal of 221220102002101 is 101200201022122.

It is a happy number.

221220102002101 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 64002960034225 + 157217141967876 = 8000185^2 + 12538626^2 .

It is a cyclic number.

It is not a de Polignac number, because 221220102002101 - 2¹ = 221220102002099 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 (221220102702101) 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, 19511380996 + ... + 19511392333.

It is an arithmetic number, because the mean of its divisors is an integer number (55314781195275).

Almost surely, 2^{221220102002101} is an apocalyptic number.

It is an amenable number.

221220102002101 is a deficient number, since it is larger than the sum of its proper divisors (39022778999).

221220102002101 is an equidigital number, since it uses as much as digits as its factorization.

221220102002101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39022778998.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 221220102002101 its reverse (101200201022122), we get a palindrome (322420303024223).

The spelling of 221220102002101 in words is "two hundred twenty-one trillion, two hundred twenty billion, one hundred two million, two thousand, one hundred one".