21593194223 has 2 divisors, whose sum is σ = 21593194224. Its totient is φ = 21593194222.

The previous prime is 21593194199. The next prime is 21593194241. The reversal of 21593194223 is 32249139512.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21593194223 - 2⁶ = 21593194159 is a prime.

It is a super-3 number, since 3×21593194223³ (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 (21593194253) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10796597111 + 10796597112.

It is an arithmetic number, because the mean of its divisors is an integer number (10796597112).

Almost surely, 2^21593194223 is an apocalyptic number.

21593194223 is a deficient number, since it is larger than the sum of its proper divisors (1).

21593194223 is an equidigital number, since it uses as much as digits as its factorization.

21593194223 is an evil number, because the sum of its binary digits is even.

The product of its digits is 116640, while the sum is 41.

The spelling of 21593194223 in words is "twenty-one billion, five hundred ninety-three million, one hundred ninety-four thousand, two hundred twenty-three".