1220105123 has 2 divisors, whose sum is σ = 1220105124. Its totient is φ = 1220105122.

The previous prime is 1220105111. The next prime is 1220105141. The reversal of 1220105123 is 3215010221.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (3215010221) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1220105123 - 2⁶ = 1220105059 is a prime.

It is a super-2 number, since 2×1220105123² = 2977313022341690258, which contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (1220105323) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610052561 + 610052562.

It is an arithmetic number, because the mean of its divisors is an integer number (610052562).

Almost surely, 2^1220105123 is an apocalyptic number.

1220105123 is a deficient number, since it is larger than the sum of its proper divisors (1).

1220105123 is an equidigital number, since it uses as much as digits as its factorization.

1220105123 is an odious number, because the sum of its binary digits is odd.

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

The square root of 1220105123 is about 34930.0031920983. The cubic root of 1220105123 is about 1068.5604197185.

Adding to 1220105123 its reverse (3215010221), we get a palindrome (4435115344).

The spelling of 1220105123 in words is "one billion, two hundred twenty million, one hundred five thousand, one hundred twenty-three".