102102320091 has 4 divisors (see below), whose sum is σ = 136136426792. Its totient is φ = 68068213392.

The previous prime is 102102320071. The next prime is 102102320101. The reversal of 102102320091 is 190023201201.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 190023201201 = 3 ⋅63341067067.

It is not a de Polignac number, because 102102320091 - 2⁶ = 102102320027 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (102102320071) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17017053346 + ... + 17017053351.

It is an arithmetic number, because the mean of its divisors is an integer number (34034106698).

Almost surely, 2^102102320091 is an apocalyptic number.

102102320091 is a deficient number, since it is larger than the sum of its proper divisors (34034106701).

102102320091 is an equidigital number, since it uses as much as digits as its factorization.

102102320091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34034106700.

The product of its (nonzero) digits is 216, while the sum is 21.

Adding to 102102320091 its reverse (190023201201), we get a palindrome (292125521292).

The spelling of 102102320091 in words is "one hundred two billion, one hundred two million, three hundred twenty thousand, ninety-one".