2123045305 has 8 divisors (see below), whose sum is σ = 2573919432. Its totient is φ = 1680926208.

The previous prime is 2123045279. The next prime is 2123045317. The reversal of 2123045305 is 5035403212.

It can be written as a sum of positive squares in 4 ways, for example, as 4376464 + 2118668841 = 2092^2 + 46029^2 .

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 2123045305 - 2¹⁹ = 2122521017 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2123045305.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2188222 + ... + 2189191.

It is an arithmetic number, because the mean of its divisors is an integer number (321739929).

Almost surely, 2^2123045305 is an apocalyptic number.

It is an amenable number.

2123045305 is a deficient number, since it is larger than the sum of its proper divisors (450874127).

2123045305 is an equidigital number, since it uses as much as digits as its factorization.

2123045305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4377515.

The product of its (nonzero) digits is 3600, while the sum is 25.

The square root of 2123045305 is about 46076.5157645411. The cubic root of 2123045305 is about 1285.2464727295.

Adding to 2123045305 its reverse (5035403212), we get a palindrome (7158448517).

The spelling of 2123045305 in words is "two billion, one hundred twenty-three million, forty-five thousand, three hundred five".