193713997721 has 8 divisors (see below), whose sum is σ = 204571725120. Its totient is φ = 183059218672.

The previous prime is 193713997709. The next prime is 193713997733. The reversal of 193713997721 is 127799317391.

It is an interprime number because it is at equal distance from previous prime (193713997709) and next prime (193713997733).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 193713997721 - 2⁶ = 193713997657 is a prime.

It is a super-2 number, since 2×193713997721² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (193713997751) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 50735126 + ... + 50738943.

It is an arithmetic number, because the mean of its divisors is an integer number (25571465640).

Almost surely, 2^193713997721 is an apocalyptic number.

It is an amenable number.

193713997721 is a deficient number, since it is larger than the sum of its proper divisors (10857727399).

193713997721 is a wasteful number, since it uses less digits than its factorization.

193713997721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101474175.

The product of its digits is 4500846, while the sum is 59.

The spelling of 193713997721 in words is "one hundred ninety-three billion, seven hundred thirteen million, nine hundred ninety-seven thousand, seven hundred twenty-one".