2123124561 has 16 divisors (see below), whose sum is σ = 3212294400. Its totient is φ = 1385300304.

The previous prime is 2123124551. The next prime is 2123124589. The reversal of 2123124561 is 1654213212.

It is not a de Polignac number, because 2123124561 - 2¹⁴ = 2123108177 is a prime.

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

It is not an unprimeable number, because it can be changed into a prime (2123124511) 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 15 ways as a sum of consecutive naturals, for example, 835266 + ... + 837803.

It is an arithmetic number, because the mean of its divisors is an integer number (200768400).

Almost surely, 2^2123124561 is an apocalyptic number.

It is an amenable number.

2123124561 is a deficient number, since it is larger than the sum of its proper divisors (1089169839).

2123124561 is a wasteful number, since it uses less digits than its factorization.

2123124561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1673125 (or 1673119 counting only the distinct ones).

The product of its digits is 2880, while the sum is 27.

The square root of 2123124561 is about 46077.3758041840. The cubic root of 2123124561 is about 1285.2624658294.

Adding to 2123124561 its reverse (1654213212), we get a palindrome (3777337773).

The spelling of 2123124561 in words is "two billion, one hundred twenty-three million, one hundred twenty-four thousand, five hundred sixty-one".