102108021786 has 12 divisors (see below), whose sum is σ = 221234047242. Its totient is φ = 34036007256.

The previous prime is 102108021779. The next prime is 102108021793. The reversal of 102108021786 is 687120801201.

It is an interprime number because it is at equal distance from previous prime (102108021779) and next prime (102108021793).

It can be written as a sum of positive squares in only one way, i.e., 87545566161 + 14562455625 = 295881^2 + 120675^2 .

It is a super-2 number, since 2×102108021786² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 102108021786.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 2836333921 + ... + 2836333956.

Almost surely, 2^102108021786 is an apocalyptic number.

102108021786 is an abundant number, since it is smaller than the sum of its proper divisors (119126025456).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

102108021786 is a wasteful number, since it uses less digits than its factorization.

102108021786 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5672667885 (or 5672667882 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 36.

Adding to 102108021786 its reverse (687120801201), we get a palindrome (789228822987).

The spelling of 102108021786 in words is "one hundred two billion, one hundred eight million, twenty-one thousand, seven hundred eighty-six".