221222101 has 4 divisors (see below), whose sum is σ = 226617804. Its totient is φ = 215826400.

The previous prime is 221222087. The next prime is 221222123. The reversal of 221222101 is 101222122.

It is a happy number.

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 100200100 + 121022001 = 10010^2 + 11001^2 .

It is a cyclic number.

It is not a de Polignac number, because 221222101 - 2⁵ = 221222069 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 (221222191) 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, 2697790 + ... + 2697871.

It is an arithmetic number, because the mean of its divisors is an integer number (56654451).

Almost surely, 2^221222101 is an apocalyptic number.

It is an amenable number.

221222101 is a deficient number, since it is larger than the sum of its proper divisors (5395703).

221222101 is an equidigital number, since it uses as much as digits as its factorization.

221222101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5395702.

The product of its (nonzero) digits is 32, while the sum is 13.

The square root of 221222101 is about 14873.5369364519. The cubic root of 221222101 is about 604.7968272538.

Adding to 221222101 its reverse (101222122), we get a palindrome (322444223).

The spelling of 221222101 in words is "two hundred twenty-one million, two hundred twenty-two thousand, one hundred one".