1223121105 has 48 divisors (see below), whose sum is σ = 2238600000. Its totient is φ = 616076928.

The previous prime is 1223121043. The next prime is 1223121127. The reversal of 1223121105 is 5011213221.

It is not a de Polignac number, because 1223121105 - 2¹² = 1223117009 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 296346 + ... + 300444.

It is an arithmetic number, because the mean of its divisors is an integer number (46637500).

Almost surely, 2^1223121105 is an apocalyptic number.

1223121105 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1223121105 is a deficient number, since it is larger than the sum of its proper divisors (1015478895).

1223121105 is a wasteful number, since it uses less digits than its factorization.

1223121105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4478 (or 4475 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 18.

The square root of 1223121105 is about 34973.1483426929. The cubic root of 1223121105 is about 1069.4401546206.

Adding to 1223121105 its reverse (5011213221), we get a palindrome (6234334326).

The spelling of 1223121105 in words is "one billion, two hundred twenty-three million, one hundred twenty-one thousand, one hundred five".