145103221 has 2 divisors, whose sum is σ = 145103222. Its totient is φ = 145103220.

The previous prime is 145103213. The next prime is 145103239. The reversal of 145103221 is 122301541.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 100280196 + 44823025 = 10014^2 + 6695^2 .

It is a cyclic number.

It is not a de Polignac number, because 145103221 - 2³ = 145103213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (145103261) 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, 72551610 + 72551611.

It is an arithmetic number, because the mean of its divisors is an integer number (72551611).

Almost surely, 2^145103221 is an apocalyptic number.

It is an amenable number.

145103221 is a deficient number, since it is larger than the sum of its proper divisors (1).

145103221 is an equidigital number, since it uses as much as digits as its factorization.

145103221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 145103221 is about 12045.8798350307. The cubic root of 145103221 is about 525.4834198854.

Adding to 145103221 its reverse (122301541), we get a palindrome (267404762).

The spelling of 145103221 in words is "one hundred forty-five million, one hundred three thousand, two hundred twenty-one".