145221203 has 2 divisors, whose sum is σ = 145221204. Its totient is φ = 145221202.

The previous prime is 145221179. The next prime is 145221253. The reversal of 145221203 is 302122541.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 145221203 - 2¹⁶ = 145155667 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (145221253) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72610601 + 72610602.

It is an arithmetic number, because the mean of its divisors is an integer number (72610602).

Almost surely, 2^145221203 is an apocalyptic number.

145221203 is a deficient number, since it is larger than the sum of its proper divisors (1).

145221203 is an equidigital number, since it uses as much as digits as its factorization.

145221203 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 145221203 is about 12050.7760331026. The cubic root of 145221203 is about 525.6258031001.

Adding to 145221203 its reverse (302122541), we get a palindrome (447343744).

The spelling of 145221203 in words is "one hundred forty-five million, two hundred twenty-one thousand, two hundred three".