221202221 has 8 divisors (see below), whose sum is σ = 226092384. Its totient is φ = 216365200.

The previous prime is 221202211. The next prime is 221202239. The reversal of 221202221 is 122202122.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 221202221 - 2¹⁸ = 220940077 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221202196 and 221202205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221202211) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4811 + ... + 21576.

It is an arithmetic number, because the mean of its divisors is an integer number (28261548).

Almost surely, 2^221202221 is an apocalyptic number.

It is an amenable number.

221202221 is a deficient number, since it is larger than the sum of its proper divisors (4890163).

221202221 is a wasteful number, since it uses less digits than its factorization.

221202221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26571.

The product of its (nonzero) digits is 64, while the sum is 14.

The square root of 221202221 is about 14872.8686204108. The cubic root of 221202221 is about 604.7787101352.

Adding to 221202221 its reverse (122202122), we get a palindrome (343404343).

Subtracting from 221202221 its reverse (122202122), we obtain a palindrome (99000099).

The spelling of 221202221 in words is "two hundred twenty-one million, two hundred two thousand, two hundred twenty-one".