21751754839 has 2 divisors, whose sum is σ = 21751754840. Its totient is φ = 21751754838.

The previous prime is 21751754807. The next prime is 21751754861. The reversal of 21751754839 is 93845715712.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21751754839 - 2⁵ = 21751754807 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21751754939) 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, 10875877419 + 10875877420.

It is an arithmetic number, because the mean of its divisors is an integer number (10875877420).

Almost surely, 2^21751754839 is an apocalyptic number.

21751754839 is a deficient number, since it is larger than the sum of its proper divisors (1).

21751754839 is an equidigital number, since it uses as much as digits as its factorization.

21751754839 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2116800, while the sum is 52.

The spelling of 21751754839 in words is "twenty-one billion, seven hundred fifty-one million, seven hundred fifty-four thousand, eight hundred thirty-nine".