102120201091 has 4 divisors (see below), whose sum is σ = 104046997392. Its totient is φ = 100193404792.

The previous prime is 102120201059. The next prime is 102120201097. The reversal of 102120201091 is 190102021201.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 102120201091 - 2⁵ = 102120201059 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (102120201097) 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, 963398071 + ... + 963398176.

It is an arithmetic number, because the mean of its divisors is an integer number (26011749348).

Almost surely, 2^102120201091 is an apocalyptic number.

102120201091 is a deficient number, since it is larger than the sum of its proper divisors (1926796301).

102120201091 is an equidigital number, since it uses as much as digits as its factorization.

102120201091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1926796300.

The product of its (nonzero) digits is 72, while the sum is 19.

Adding to 102120201091 its reverse (190102021201), we get a palindrome (292222222292).

The spelling of 102120201091 in words is "one hundred two billion, one hundred twenty million, two hundred one thousand, ninety-one".