102120212221 has 32 divisors (see below), whose sum is σ = 110082405888. Its totient is φ = 94510141440.

The previous prime is 102120212197. The next prime is 102120212237. The reversal of 102120212221 is 122212021201.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 102120212221 - 2⁵ = 102120212189 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 102120212195 and 102120212204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102120212261) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 36772185 + ... + 36774961.

It is an arithmetic number, because the mean of its divisors is an integer number (3440075184).

Almost surely, 2^102120212221 is an apocalyptic number.

It is an amenable number.

102120212221 is a deficient number, since it is larger than the sum of its proper divisors (7962193667).

102120212221 is a wasteful number, since it uses less digits than its factorization.

102120212221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3261.

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

Adding to 102120212221 its reverse (122212021201), we get a palindrome (224332233422).

The spelling of 102120212221 in words is "one hundred two billion, one hundred twenty million, two hundred twelve thousand, two hundred twenty-one".