103106221 has 2 divisors, whose sum is σ = 103106222. Its totient is φ = 103106220.

The previous prime is 103106219. The next prime is 103106231. The reversal of 103106221 is 122601301.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 64802500 + 38303721 = 8050^2 + 6189^2 .

It is an emirp because it is prime and its reverse (122601301) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 103106221 - 2¹ = 103106219 is a prime.

It is a super-3 number, since 3×103106221³ (a number of 25 digits) contains 333 as substring.

Together with 103106219, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 103106195 and 103106204.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (103106231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51553110 + 51553111.

It is an arithmetic number, because the mean of its divisors is an integer number (51553111).

Almost surely, 2^103106221 is an apocalyptic number.

It is an amenable number.

103106221 is a deficient number, since it is larger than the sum of its proper divisors (1).

103106221 is an equidigital number, since it uses as much as digits as its factorization.

103106221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 103106221 is about 10154.1233496546. The cubic root of 103106221 is about 468.9158972856.

Adding to 103106221 its reverse (122601301), we get a palindrome (225707522).

The spelling of 103106221 in words is "one hundred three million, one hundred six thousand, two hundred twenty-one".