2123520345 has 12 divisors (see below), whose sum is σ = 3680768676. Its totient is φ = 1132544160.

The previous prime is 2123520319. The next prime is 2123520361. The reversal of 2123520345 is 5430253212.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 671224464 + 1452295881 = 25908^2 + 38109^2 .

It is not a de Polignac number, because 2123520345 - 2⁶ = 2123520281 is a prime.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 23594626 + ... + 23594715.

It is an arithmetic number, because the mean of its divisors is an integer number (306730723).

Almost surely, 2^2123520345 is an apocalyptic number.

It is an amenable number.

2123520345 is a deficient number, since it is larger than the sum of its proper divisors (1557248331).

2123520345 is a wasteful number, since it uses less digits than its factorization.

2123520345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47189352 (or 47189349 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 27.

The square root of 2123520345 is about 46081.6703798810. The cubic root of 2123520345 is about 1285.3423252849.

Adding to 2123520345 its reverse (5430253212), we get a palindrome (7553773557).

The spelling of 2123520345 in words is "two billion, one hundred twenty-three million, five hundred twenty thousand, three hundred forty-five".