146403221 has 2 divisors, whose sum is σ = 146403222. Its totient is φ = 146403220.

The previous prime is 146403217. The next prime is 146403239. The reversal of 146403221 is 122304641.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 143664196 + 2739025 = 11986^2 + 1655^2 .

It is a cyclic number.

It is not a de Polignac number, because 146403221 - 2² = 146403217 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (146403121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 73201610 + 73201611.

It is an arithmetic number, because the mean of its divisors is an integer number (73201611).

Almost surely, 2^146403221 is an apocalyptic number.

It is an amenable number.

146403221 is a deficient number, since it is larger than the sum of its proper divisors (1).

146403221 is an equidigital number, since it uses as much as digits as its factorization.

146403221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 146403221 is about 12099.7198727904. The cubic root of 146403221 is about 527.0480496572.

Adding to 146403221 its reverse (122304641), we get a palindrome (268707862).

The spelling of 146403221 in words is "one hundred forty-six million, four hundred three thousand, two hundred twenty-one".