102110221 has 4 divisors (see below), whose sum is σ = 102196444. Its totient is φ = 102024000.

The previous prime is 102110191. The next prime is 102110227. The reversal of 102110221 is 122011201.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 11594025 + 90516196 = 3405^2 + 9514^2 .

It is a cyclic number.

It is not a de Polignac number, because 102110221 - 2¹⁵ = 102077453 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 102110198 and 102110207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102110227) 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, 41310 + ... + 43711.

It is an arithmetic number, because the mean of its divisors is an integer number (25549111).

Almost surely, 2^102110221 is an apocalyptic number.

It is an amenable number.

102110221 is a deficient number, since it is larger than the sum of its proper divisors (86223).

102110221 is an equidigital number, since it uses as much as digits as its factorization.

102110221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86222.

The product of its (nonzero) digits is 8, while the sum is 10.

The square root of 102110221 is about 10104.9602176357. The cubic root of 102110221 is about 467.4011092268.

Adding to 102110221 its reverse (122011201), we get a palindrome (224121422).

The spelling of 102110221 in words is "one hundred two million, one hundred ten thousand, two hundred twenty-one".