126506221 has 2 divisors, whose sum is σ = 126506222. Its totient is φ = 126506220.

The previous prime is 126506201. The next prime is 126506227. The reversal of 126506221 is 122605621.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 112593321 + 13912900 = 10611^2 + 3730^2 .

It is a cyclic number.

It is not a de Polignac number, because 126506221 - 2⁵ = 126506189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (126506227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63253110 + 63253111.

It is an arithmetic number, because the mean of its divisors is an integer number (63253111).

Almost surely, 2^126506221 is an apocalyptic number.

It is an amenable number.

126506221 is a deficient number, since it is larger than the sum of its proper divisors (1).

126506221 is an equidigital number, since it uses as much as digits as its factorization.

126506221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 126506221 is about 11247.4984329850. The cubic root of 126506221 is about 502.0002817414. Note that the first 3 decimals are identical.

The spelling of 126506221 in words is "one hundred twenty-six million, five hundred six thousand, two hundred twenty-one".