102101855 has 4 divisors (see below), whose sum is σ = 122522232. Its totient is φ = 81681480.

The previous prime is 102101851. The next prime is 102101921. The reversal of 102101855 is 558101201.

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

It is not a de Polignac number, because 102101855 - 2² = 102101851 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 102101855.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102101851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10210181 + ... + 10210190.

It is an arithmetic number, because the mean of its divisors is an integer number (30630558).

Almost surely, 2^102101855 is an apocalyptic number.

102101855 is a deficient number, since it is larger than the sum of its proper divisors (20420377).

102101855 is an equidigital number, since it uses as much as digits as its factorization.

102101855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20420376.

The product of its (nonzero) digits is 400, while the sum is 23.

The square root of 102101855 is about 10104.5462540383. The cubic root of 102101855 is about 467.3883439867.

The spelling of 102101855 in words is "one hundred two million, one hundred one thousand, eight hundred fifty-five".