145038221 has 2 divisors, whose sum is σ = 145038222. Its totient is φ = 145038220.

The previous prime is 145038217. The next prime is 145038247. The reversal of 145038221 is 122830541.

It is an a-pointer prime, because the next prime (145038247) can be obtained adding 145038221 to its sum of digits (26).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 81198121 + 63840100 = 9011^2 + 7990^2 .

It is an emirp because it is prime and its reverse (122830541) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 145038221 - 2² = 145038217 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (145038211) 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, 72519110 + 72519111.

It is an arithmetic number, because the mean of its divisors is an integer number (72519111).

Almost surely, 2^145038221 is an apocalyptic number.

It is an amenable number.

145038221 is a deficient number, since it is larger than the sum of its proper divisors (1).

145038221 is an equidigital number, since it uses as much as digits as its factorization.

145038221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1920, while the sum is 26.

The square root of 145038221 is about 12043.1815148656. The cubic root of 145038221 is about 525.4049435118.

Adding to 145038221 its reverse (122830541), we get a palindrome (267868762).

The spelling of 145038221 in words is "one hundred forty-five million, thirty-eight thousand, two hundred twenty-one".