101222221 has 4 divisors (see below), whose sum is σ = 101541852. Its totient is φ = 100902592.

The previous prime is 101222213. The next prime is 101222227. The reversal of 101222221 is 122222101.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 122222101 = 61 ⋅2003641.

It can be written as a sum of positive squares in 2 ways, for example, as 1920996 + 99301225 = 1386^2 + 9965^2 .

It is a cyclic number.

It is not a de Polignac number, because 101222221 - 2³ = 101222213 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 (101222227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 159340 + ... + 159973.

It is an arithmetic number, because the mean of its divisors is an integer number (25385463).

Almost surely, 2^101222221 is an apocalyptic number.

It is an amenable number.

101222221 is a deficient number, since it is larger than the sum of its proper divisors (319631).

101222221 is an equidigital number, since it uses as much as digits as its factorization.

101222221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 319630.

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

The square root of 101222221 is about 10060.9254544500. The cubic root of 101222221 is about 466.0422469020.

Adding to 101222221 its reverse (122222101), we get a palindrome (223444322).

The spelling of 101222221 in words is "one hundred one million, two hundred twenty-two thousand, two hundred twenty-one".