21593194195 has 16 divisors (see below), whose sum is σ = 27292573440. Its totient is φ = 16355192544.

The previous prime is 21593194159. The next prime is 21593194199. The reversal of 21593194195 is 59149139512.

It is a cyclic number.

It is not a de Polignac number, because 21593194195 - 2¹¹ = 21593192147 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21593194199) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 84714 + ... + 224416.

It is an arithmetic number, because the mean of its divisors is an integer number (1705785840).

Almost surely, 2^21593194195 is an apocalyptic number.

21593194195 is a deficient number, since it is larger than the sum of its proper divisors (5699379245).

21593194195 is a wasteful number, since it uses less digits than its factorization.

21593194195 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141354.

The product of its digits is 437400, while the sum is 49.

The spelling of 21593194195 in words is "twenty-one billion, five hundred ninety-three million, one hundred ninety-four thousand, one hundred ninety-five".