1221224105 has 8 divisors (see below), whose sum is σ = 1465755912. Its totient is φ = 976787968.

The previous prime is 1221224101. The next prime is 1221224111. The reversal of 1221224105 is 5014221221.

It can be written as a sum of positive squares in 4 ways, for example, as 54523456 + 1166700649 = 7384^2 + 34157^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1221224105 - 2² = 1221224101 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1221224101) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8057 + ... + 50073.

It is an arithmetic number, because the mean of its divisors is an integer number (183219489).

Almost surely, 2^1221224105 is an apocalyptic number.

It is an amenable number.

1221224105 is a deficient number, since it is larger than the sum of its proper divisors (244531807).

1221224105 is an equidigital number, since it uses as much as digits as its factorization.

1221224105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47835.

The product of its (nonzero) digits is 320, while the sum is 20.

The square root of 1221224105 is about 34946.0170119572. The cubic root of 1221224105 is about 1068.8869857129.

Adding to 1221224105 its reverse (5014221221), we get a palindrome (6235445326).

The spelling of 1221224105 in words is "one billion, two hundred twenty-one million, two hundred twenty-four thousand, one hundred five".