221202101 has 4 divisors (see below), whose sum is σ = 221426304. Its totient is φ = 220977900.

The previous prime is 221202077. The next prime is 221202119. The reversal of 221202101 is 101202122.

It is a happy number.

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.

It is a cyclic number.

It is not a de Polignac number, because 221202101 - 2²⁶ = 154093237 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 (221202131) 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, 110615 + ... + 112596.

It is an arithmetic number, because the mean of its divisors is an integer number (55356576).

Almost surely, 2^221202101 is an apocalyptic number.

It is an amenable number.

221202101 is a deficient number, since it is larger than the sum of its proper divisors (224203).

221202101 is an equidigital number, since it uses as much as digits as its factorization.

221202101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 224202.

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

The square root of 221202101 is about 14872.8645862188. The cubic root of 221202101 is about 604.7786007731.

Adding to 221202101 its reverse (101202122), we get a palindrome (322404223).

The spelling of 221202101 in words is "two hundred twenty-one million, two hundred two thousand, one hundred one".