221222201 has 4 divisors (see below), whose sum is σ = 221645712. Its totient is φ = 220798692.

The previous prime is 221222191. The next prime is 221222203. The reversal of 221222201 is 102222122.

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 a de Polignac number, because none of the positive numbers 2^k-221222201 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 (221222203) 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, 210971 + ... + 212016.

It is an arithmetic number, because the mean of its divisors is an integer number (55411428).

Almost surely, 2^221222201 is an apocalyptic number.

It is an amenable number.

221222201 is a deficient number, since it is larger than the sum of its proper divisors (423511).

221222201 is an equidigital number, since it uses as much as digits as its factorization.

221222201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 423510.

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

The square root of 221222201 is about 14873.5402981267. The cubic root of 221222201 is about 604.7969183834.

Adding to 221222201 its reverse (102222122), we get a palindrome (323444323).

The spelling of 221222201 in words is "two hundred twenty-one million, two hundred twenty-two thousand, two hundred one".