103228721 has 2 divisors, whose sum is σ = 103228722. Its totient is φ = 103228720.

The previous prime is 103228717. The next prime is 103228753. The reversal of 103228721 is 127822301.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 94789696 + 8439025 = 9736^2 + 2905^2 .

It is a cyclic number.

It is not a de Polignac number, because 103228721 - 2² = 103228717 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (103228711) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51614360 + 51614361.

It is an arithmetic number, because the mean of its divisors is an integer number (51614361).

Almost surely, 2^103228721 is an apocalyptic number.

It is an amenable number.

103228721 is a deficient number, since it is larger than the sum of its proper divisors (1).

103228721 is an equidigital number, since it uses as much as digits as its factorization.

103228721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1344, while the sum is 26.

The square root of 103228721 is about 10160.1535913587. The cubic root of 103228721 is about 469.1015293549.

The spelling of 103228721 in words is "one hundred three million, two hundred twenty-eight thousand, seven hundred twenty-one".