2123545005 has 40 divisors (see below), whose sum is σ = 3842305632. Its totient is φ = 1121949792.

The previous prime is 2123545001. The next prime is 2123545019. The reversal of 2123545005 is 5005453212.

It is a happy number.

It is not a de Polignac number, because 2123545005 - 2² = 2123545001 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a self number, because there is not a number n which added to its sum of digits gives 2123545005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2123545001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 18834 + ... + 67836.

Almost surely, 2^2123545005 is an apocalyptic number.

It is an amenable number.

2123545005 is a deficient number, since it is larger than the sum of its proper divisors (1718760627).

2123545005 is a wasteful number, since it uses less digits than its factorization.

2123545005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49127 (or 49118 counting only the distinct ones).

The product of its (nonzero) digits is 6000, while the sum is 27.

The square root of 2123545005 is about 46081.9379475299. The cubic root of 2123545005 is about 1285.3473007366.

Adding to 2123545005 its reverse (5005453212), we get a palindrome (7128998217).

The spelling of 2123545005 in words is "two billion, one hundred twenty-three million, five hundred forty-five thousand, five".