427221173 has 2 divisors, whose sum is σ = 427221174. Its totient is φ = 427221172.

The previous prime is 427221167. The next prime is 427221187. The reversal of 427221173 is 371122724.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 410386564 + 16834609 = 20258^2 + 4103^2 .

It is a cyclic number.

It is not a de Polignac number, because 427221173 - 2¹⁶ = 427155637 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (427221103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 213610586 + 213610587.

It is an arithmetic number, because the mean of its divisors is an integer number (213610587).

Almost surely, 2^427221173 is an apocalyptic number.

It is an amenable number.

427221173 is a deficient number, since it is larger than the sum of its proper divisors (1).

427221173 is an equidigital number, since it uses as much as digits as its factorization.

427221173 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4704, while the sum is 29.

The square root of 427221173 is about 20669.3292827803. The cubic root of 427221173 is about 753.1548134476.

Adding to 427221173 its reverse (371122724), we get a palindrome (798343897).

The spelling of 427221173 in words is "four hundred twenty-seven million, two hundred twenty-one thousand, one hundred seventy-three".