221102201 has 4 divisors (see below), whose sum is σ = 221542272. Its totient is φ = 220662132.

The previous prime is 221102191. The next prime is 221102213. The reversal of 221102201 is 102201122.

It is a happy number.

221102201 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, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 102201122 = 2 ⋅51100561.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221102201 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (221102251) 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, 219281 + ... + 220286.

It is an arithmetic number, because the mean of its divisors is an integer number (55385568).

Almost surely, 2^221102201 is an apocalyptic number.

It is an amenable number.

221102201 is a deficient number, since it is larger than the sum of its proper divisors (440071).

221102201 is an equidigital number, since it uses as much as digits as its factorization.

221102201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 440070.

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 221102201 is about 14869.5057416176. The cubic root of 221102201 is about 604.6875430487.

Adding to 221102201 its reverse (102201122), we get a palindrome (323303323).

The spelling of 221102201 in words is "two hundred twenty-one million, one hundred two thousand, two hundred one".