21319756093 has 2 divisors, whose sum is σ = 21319756094. Its totient is φ = 21319756092.

The previous prime is 21319756063. The next prime is 21319756109. The reversal of 21319756093 is 39065791312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15424894809 + 5894861284 = 124197^2 + 76778^2 .

It is a cyclic number.

It is not a de Polignac number, because 21319756093 - 2³³ = 12729821501 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21319756043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10659878046 + 10659878047.

It is an arithmetic number, because the mean of its divisors is an integer number (10659878047).

Almost surely, 2^21319756093 is an apocalyptic number.

It is an amenable number.

21319756093 is a deficient number, since it is larger than the sum of its proper divisors (1).

21319756093 is an equidigital number, since it uses as much as digits as its factorization.

21319756093 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 306180, while the sum is 46.

The spelling of 21319756093 in words is "twenty-one billion, three hundred nineteen million, seven hundred fifty-six thousand, ninety-three".