2123780945 has 32 divisors (see below), whose sum is σ = 3075045120. Its totient is φ = 1387203840.

The previous prime is 2123780921. The next prime is 2123780957. The reversal of 2123780945 is 5490873212.

It is not a de Polignac number, because 2123780945 - 2⁶ = 2123780881 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 31 ways as a sum of consecutive naturals, for example, 13685 + ... + 66594.

It is an arithmetic number, because the mean of its divisors is an integer number (96095160).

Almost surely, 2^2123780945 is an apocalyptic number.

It is an amenable number.

2123780945 is a deficient number, since it is larger than the sum of its proper divisors (951264175).

2123780945 is a wasteful number, since it uses less digits than its factorization.

2123780945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80345.

The product of its (nonzero) digits is 120960, while the sum is 41.

The square root of 2123780945 is about 46084.4978816087. The cubic root of 2123780945 is about 1285.3949025237.

The spelling of 2123780945 in words is "two billion, one hundred twenty-three million, seven hundred eighty thousand, nine hundred forty-five".