2120123105 has 4 divisors (see below), whose sum is σ = 2544147732. Its totient is φ = 1696098480.

The previous prime is 2120123101. The next prime is 2120123107. The reversal of 2120123105 is 5013210212.

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 1180884496 + 939238609 = 34364^2 + 30647^2 .

It is not a de Polignac number, because 2120123105 - 2² = 2120123101 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2120123101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 212012306 + ... + 212012315.

It is an arithmetic number, because the mean of its divisors is an integer number (636036933).

Almost surely, 2^2120123105 is an apocalyptic number.

It is an amenable number.

2120123105 is a deficient number, since it is larger than the sum of its proper divisors (424024627).

2120123105 is an equidigital number, since it uses as much as digits as its factorization.

2120123105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 424024626.

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

The square root of 2120123105 is about 46044.7945483526. The cubic root of 2120123105 is about 1284.6565227312.

Adding to 2120123105 its reverse (5013210212), we get a palindrome (7133333317).

The spelling of 2120123105 in words is "two billion, one hundred twenty million, one hundred twenty-three thousand, one hundred five".