102212121221 has 4 divisors (see below), whose sum is σ = 116813852832. Its totient is φ = 87610389612.

The previous prime is 102212121197. The next prime is 102212121227. The reversal of 102212121221 is 122121212201.

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.

It is a cyclic number.

It is not a de Polignac number, because 102212121221 - 2³⁴ = 85032252037 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 102212121221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102212121227) 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, 7300865795 + ... + 7300865808.

It is an arithmetic number, because the mean of its divisors is an integer number (29203463208).

Almost surely, 2^102212121221 is an apocalyptic number.

It is an amenable number.

102212121221 is a deficient number, since it is larger than the sum of its proper divisors (14601731611).

102212121221 is an equidigital number, since it uses as much as digits as its factorization.

102212121221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14601731610.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 102212121221 its reverse (122121212201), we get a palindrome (224333333422).

The spelling of 102212121221 in words is "one hundred two billion, two hundred twelve million, one hundred twenty-one thousand, two hundred twenty-one".