102121214218 has 4 divisors (see below), whose sum is σ = 153181821330. Its totient is φ = 51060607108.

The previous prime is 102121214207. The next prime is 102121214219. The reversal of 102121214218 is 812412121201.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 812412121201 = 1153 ⋅704607217.

It can be written as a sum of positive squares in only one way, i.e., 85727740849 + 16393473369 = 292793^2 + 128037^2 .

It is a junction number, because it is equal to n+sod(n) for n = 102121214192 and 102121214201.

It is not an unprimeable number, because it can be changed into a prime (102121214219) 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 as a sum of consecutive naturals, namely, 25530303553 + ... + 25530303556.

Almost surely, 2^102121214218 is an apocalyptic number.

102121214218 is a deficient number, since it is larger than the sum of its proper divisors (51060607112).

102121214218 is an equidigital number, since it uses as much as digits as its factorization.

102121214218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51060607111.

The product of its (nonzero) digits is 512, while the sum is 25.

Adding to 102121214218 its reverse (812412121201), we get a palindrome (914533335419).

The spelling of 102121214218 in words is "one hundred two billion, one hundred twenty-one million, two hundred fourteen thousand, two hundred eighteen".