1213220105 has 4 divisors (see below), whose sum is σ = 1455864132. Its totient is φ = 970576080.

The previous prime is 1213220089. The next prime is 1213220131. The reversal of 1213220105 is 5010223121.

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 179211769 + 1034008336 = 13387^2 + 32156^2 .

It is not a de Polignac number, because 1213220105 - 2⁴ = 1213220089 is a prime.

It is a super-2 number, since 2×1213220105² = 2943806046352422050, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 121322006 + ... + 121322015.

It is an arithmetic number, because the mean of its divisors is an integer number (363966033).

Almost surely, 2^1213220105 is an apocalyptic number.

It is an amenable number.

1213220105 is a deficient number, since it is larger than the sum of its proper divisors (242644027).

1213220105 is an equidigital number, since it uses as much as digits as its factorization.

1213220105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 242644026.

The product of its (nonzero) digits is 120, while the sum is 17.

The square root of 1213220105 is about 34831.3092633625. The cubic root of 1213220105 is about 1066.5466752503.

Adding to 1213220105 its reverse (5010223121), we get a palindrome (6223443226).

The spelling of 1213220105 in words is "one billion, two hundred thirteen million, two hundred twenty thousand, one hundred five".