21751404319 has 2 divisors, whose sum is σ = 21751404320. Its totient is φ = 21751404318.

The previous prime is 21751404287. The next prime is 21751404391. The reversal of 21751404319 is 91340415712.

It is a happy number.

Together with next prime (21751404391) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21751404319 - 2⁵ = 21751404287 is a prime.

It is a super-2 number, since 2×21751404319² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21751401319) 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, 10875702159 + 10875702160.

It is an arithmetic number, because the mean of its divisors is an integer number (10875702160).

Almost surely, 2^21751404319 is an apocalyptic number.

21751404319 is a deficient number, since it is larger than the sum of its proper divisors (1).

21751404319 is an equidigital number, since it uses as much as digits as its factorization.

21751404319 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 30240, while the sum is 37.

The spelling of 21751404319 in words is "twenty-one billion, seven hundred fifty-one million, four hundred four thousand, three hundred nineteen".