102191742793721 has 4 divisors (see below), whose sum is σ = 116790563192832. Its totient is φ = 87592922394612.

The previous prime is 102191742793667. The next prime is 102191742793741. The reversal of 102191742793721 is 127397247191201.

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.

It is a cyclic number.

It is not a de Polignac number, because 102191742793721 - 2³⁰ = 102190669051897 is a prime.

It is a super-4 number, since 4×102191742793721⁴ (a number of 57 digits) contains 4444 as substring. Note that it is a super-d number also for d = 3.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (102191742793741) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7299410199545 + ... + 7299410199558.

It is an arithmetic number, because the mean of its divisors is an integer number (29197640798208).

Almost surely, 2^{102191742793721} is an apocalyptic number.

It is an amenable number.

102191742793721 is a deficient number, since it is larger than the sum of its proper divisors (14598820399111).

102191742793721 is an equidigital number, since it uses as much as digits as its factorization.

102191742793721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14598820399110.

The product of its (nonzero) digits is 2667168, while the sum is 56.

The spelling of 102191742793721 in words is "one hundred two trillion, one hundred ninety-one billion, seven hundred forty-two million, seven hundred ninety-three thousand, seven hundred twenty-one".