427221671 has 4 divisors (see below), whose sum is σ = 428846352. Its totient is φ = 425596992.

The previous prime is 427221661. The next prime is 427221673. The reversal of 427221671 is 176122724.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-427221671 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (427221673) 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 in 3 ways as a sum of consecutive naturals, for example, 811946 + ... + 812471.

It is an arithmetic number, because the mean of its divisors is an integer number (107211588).

Almost surely, 2^427221671 is an apocalyptic number.

427221671 is a deficient number, since it is larger than the sum of its proper divisors (1624681).

427221671 is a wasteful number, since it uses less digits than its factorization.

427221671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1624680.

The product of its digits is 9408, while the sum is 32.

The square root of 427221671 is about 20669.3413296118. The cubic root of 427221671 is about 753.1551060915.

The spelling of 427221671 in words is "four hundred twenty-seven million, two hundred twenty-one thousand, six hundred seventy-one".