16103221 has 2 divisors, whose sum is σ = 16103222. Its totient is φ = 16103220.

The previous prime is 16103159. The next prime is 16103237. The reversal of 16103221 is 12230161.

It is an a-pointer prime, because the next prime (16103237) can be obtained adding 16103221 to its sum of digits (16).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12680721 + 3422500 = 3561^2 + 1850^2 .

It is an emirp because it is prime and its reverse (12230161) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16103221 - 2¹⁷ = 15972149 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 16103195 and 16103204.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16100221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8051610 + 8051611.

It is an arithmetic number, because the mean of its divisors is an integer number (8051611).

Almost surely, 2^16103221 is an apocalyptic number.

It is an amenable number.

16103221 is a deficient number, since it is larger than the sum of its proper divisors (1).

16103221 is an equidigital number, since it uses as much as digits as its factorization.

16103221 is an evil number, because the sum of its binary digits is even.

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

The square root of 16103221 is about 4012.8818821391. The cubic root of 16103221 is about 252.5249251609.

Adding to 16103221 its reverse (12230161), we get a palindrome (28333382).

It can be divided in two parts, 1610 and 3221, that multiplied together give a triangular number (5185810 = T₃₂₂₀).

The spelling of 16103221 in words is "sixteen million, one hundred three thousand, two hundred twenty-one".