102104221 has 2 divisors, whose sum is σ = 102104222. Its totient is φ = 102104220.

The previous prime is 102104203. The next prime is 102104239. The reversal of 102104221 is 122401201.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (102104203) and next prime (102104239).

It can be written as a sum of positive squares in only one way, i.e., 75951225 + 26152996 = 8715^2 + 5114^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-102104221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (102104281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51052110 + 51052111.

It is an arithmetic number, because the mean of its divisors is an integer number (51052111).

Almost surely, 2^102104221 is an apocalyptic number.

It is an amenable number.

102104221 is a deficient number, since it is larger than the sum of its proper divisors (1).

102104221 is an equidigital number, since it uses as much as digits as its factorization.

102104221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32, while the sum is 13.

The square root of 102104221 is about 10104.6633293742. The cubic root of 102104221 is about 467.3919542126.

Adding to 102104221 its reverse (122401201), we get a palindrome (224505422).

The spelling of 102104221 in words is "one hundred two million, one hundred four thousand, two hundred twenty-one".