221222105 has 16 divisors (see below), whose sum is σ = 302705424. Its totient is φ = 153753600.

The previous prime is 221222087. The next prime is 221222123. The reversal of 221222105 is 501222122.

It is an interprime number because it is at equal distance from previous prime (221222087) and next prime (221222123).

It can be written as a sum of positive squares in 8 ways, for example, as 33860761 + 187361344 = 5819^2 + 13688^2 .

It is not a de Polignac number, because 221222105 - 2⁸ = 221221849 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 98996 + ... + 101205.

It is an arithmetic number, because the mean of its divisors is an integer number (18919089).

Almost surely, 2^221222105 is an apocalyptic number.

It is an amenable number.

221222105 is a deficient number, since it is larger than the sum of its proper divisors (81483319).

221222105 is a wasteful number, since it uses less digits than its factorization.

221222105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 200236.

The product of its (nonzero) digits is 160, while the sum is 17.

The square root of 221222105 is about 14873.5370709189. The cubic root of 221222105 is about 604.7968308990.

Adding to 221222105 its sum of digits (17), we get a palindrome (221222122).

Adding to 221222105 its reverse (501222122), we get a palindrome (722444227).

The spelling of 221222105 in words is "two hundred twenty-one million, two hundred twenty-two thousand, one hundred five".