221449273 has 2 divisors, whose sum is σ = 221449274. Its totient is φ = 221449272.

The previous prime is 221449253. The next prime is 221449297. The reversal of 221449273 is 372944122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 210743289 + 10705984 = 14517^2 + 3272^2 .

It is a cyclic number.

It is not a de Polignac number, because 221449273 - 2²¹ = 219352121 is a prime.

It is equal to p_12197923 and since 221449273 and 12197923 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (221449253) 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, 110724636 + 110724637.

It is an arithmetic number, because the mean of its divisors is an integer number (110724637).

Almost surely, 2^221449273 is an apocalyptic number.

It is an amenable number.

221449273 is a deficient number, since it is larger than the sum of its proper divisors (1).

221449273 is an equidigital number, since it uses as much as digits as its factorization.

221449273 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 24192, while the sum is 34.

The square root of 221449273 is about 14881.1717616591. The cubic root of 221449273 is about 605.0037774962.

The spelling of 221449273 in words is "two hundred twenty-one million, four hundred forty-nine thousand, two hundred seventy-three".