102102212221 has 4 divisors (see below), whose sum is σ = 102107953600. Its totient is φ = 102096470844.

The previous prime is 102102212207. The next prime is 102102212227. The reversal of 102102212221 is 122212201201.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 122212201201 = 31 ⋅3942329071.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-102102212221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 102102212195 and 102102212204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102102212227) 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, 2843931 + ... + 2879608.

It is an arithmetic number, because the mean of its divisors is an integer number (25526988400).

Almost surely, 2^102102212221 is an apocalyptic number.

It is an amenable number.

102102212221 is a deficient number, since it is larger than the sum of its proper divisors (5741379).

102102212221 is an equidigital number, since it uses as much as digits as its factorization.

102102212221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5741378.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 102102212221 its reverse (122212201201), we get a palindrome (224314413422).

The spelling of 102102212221 in words is "one hundred two billion, one hundred two million, two hundred twelve thousand, two hundred twenty-one".