102112221 has 8 divisors (see below), whose sum is σ = 138181984.
Its totient is φ = 67058640.
The previous prime is 102112211. The next prime is 102112223. The reversal of 102112221 is 122211201.
It is a sphenic number, since it is the product of 3 distinct primes.
It is not a de Polignac number, because 102112221 - 25 = 102112189 is a prime.
It is a Duffinian number.
It is a junction number, because it is equal to n+sod(n) for n = 102112197 and 102112206.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (102112223) by changing a digit.
It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 253810 + ... + 254211.
It is an arithmetic number, because the mean of its divisors is an integer number (17272748).
Almost surely, 2102112221 is an apocalyptic number.
It is an amenable number.
102112221 is a deficient number, since it is larger than the sum of its proper divisors (36069763).
102112221 is an equidigital number, since it uses as much as digits as its factorization.
102112221 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 508091.
The product of its (nonzero) digits is 16, while the sum is 12.
The square root of 102112221 is about 10105.0591784512.
The cubic root of 102112221 is about 467.4041608186.
Adding to 102112221 its reverse (122211201), we get a palindrome (224323422).
The spelling of 102112221 in words is "one hundred two million, one hundred twelve thousand, two hundred twenty-one".