21752230723 has 2 divisors, whose sum is σ = 21752230724. Its totient is φ = 21752230722.

The previous prime is 21752230667. The next prime is 21752230757. The reversal of 21752230723 is 32703225712.

It is an a-pointer prime, because the next prime (21752230757) can be obtained adding 21752230723 to its sum of digits (34).

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21752230723 - 2³³ = 13162296131 is a prime.

It is not a weakly prime, because it can be changed into another prime (21752230783) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10876115361 + 10876115362.

It is an arithmetic number, because the mean of its divisors is an integer number (10876115362).

Almost surely, 2^21752230723 is an apocalyptic number.

21752230723 is a deficient number, since it is larger than the sum of its proper divisors (1).

21752230723 is an equidigital number, since it uses as much as digits as its factorization.

21752230723 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 35280, while the sum is 34.

The spelling of 21752230723 in words is "twenty-one billion, seven hundred fifty-two million, two hundred thirty thousand, seven hundred twenty-three".