2123732521 has 2 divisors, whose sum is σ = 2123732522. Its totient is φ = 2123732520.

The previous prime is 2123732519. The next prime is 2123732551. The reversal of 2123732521 is 1252373212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1191285225 + 932447296 = 34515^2 + 30536^2 .

It is a cyclic number.

It is not a de Polignac number, because 2123732521 - 2¹ = 2123732519 is a prime.

Together with 2123732519, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 2123732521.

It is not a weakly prime, because it can be changed into another prime (2123732551) 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 as a sum of consecutive naturals, namely, 1061866260 + 1061866261.

It is an arithmetic number, because the mean of its divisors is an integer number (1061866261).

Almost surely, 2^2123732521 is an apocalyptic number.

It is an amenable number.

2123732521 is a deficient number, since it is larger than the sum of its proper divisors (1).

2123732521 is an equidigital number, since it uses as much as digits as its factorization.

2123732521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5040, while the sum is 28.

The square root of 2123732521 is about 46083.9724958689. The cubic root of 2123732521 is about 1285.3851330861.

The spelling of 2123732521 in words is "two billion, one hundred twenty-three million, seven hundred thirty-two thousand, five hundred twenty-one".