21793091093 has 2 divisors, whose sum is σ = 21793091094. Its totient is φ = 21793091092.

The previous prime is 21793091039. The next prime is 21793091107. The reversal of 21793091093 is 39019039712.

Together with previous prime (21793091039) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20147815249 + 1645275844 = 141943^2 + 40562^2 .

It is a cyclic number.

It is not a de Polignac number, because 21793091093 - 2²⁸ = 21524655637 is a prime.

It is a super-3 number, since 3×21793091093³ (a number of 32 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21793091003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10896545546 + 10896545547.

It is an arithmetic number, because the mean of its divisors is an integer number (10896545547).

Almost surely, 2^21793091093 is an apocalyptic number.

It is an amenable number.

21793091093 is a deficient number, since it is larger than the sum of its proper divisors (1).

21793091093 is an equidigital number, since it uses as much as digits as its factorization.

21793091093 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 91854, while the sum is 44.

The spelling of 21793091093 in words is "twenty-one billion, seven hundred ninety-three million, ninety-one thousand, ninety-three".