193247393921 has 4 divisors (see below), whose sum is σ = 194769027072. Its totient is φ = 191725760772.

The previous prime is 193247393893. The next prime is 193247393923. The reversal of 193247393921 is 129393742391.

193247393921 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 129393742391 = 1811 ⋅71448781.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-193247393921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (193247393923) 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 in 3 ways as a sum of consecutive naturals, for example, 760816385 + ... + 760816638.

It is an arithmetic number, because the mean of its divisors is an integer number (48692256768).

Almost surely, 2^193247393921 is an apocalyptic number.

It is an amenable number.

193247393921 is a deficient number, since it is larger than the sum of its proper divisors (1521633151).

193247393921 is a wasteful number, since it uses less digits than its factorization.

193247393921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1521633150.

The product of its digits is 2204496, while the sum is 53.

The spelling of 193247393921 in words is "one hundred ninety-three billion, two hundred forty-seven million, three hundred ninety-three thousand, nine hundred twenty-one".