8427277421 has 4 divisors (see below), whose sum is σ = 8432119644. Its totient is φ = 8422435200.

The previous prime is 8427277379. The next prime is 8427277447. The reversal of 8427277421 is 1247727248.

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

It can be written as a sum of positive squares in 2 ways, for example, as 3591604900 + 4835672521 = 59930^2 + 69539^2 .

It is a cyclic number.

It is not a de Polignac number, because 8427277421 - 2⁶ = 8427277357 is a prime.

It is a super-2 number, since 2×8427277421² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8427277321) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2418500 + ... + 2421981.

It is an arithmetic number, because the mean of its divisors is an integer number (2108029911).

Almost surely, 2^8427277421 is an apocalyptic number.

It is an amenable number.

8427277421 is a deficient number, since it is larger than the sum of its proper divisors (4842223).

8427277421 is a wasteful number, since it uses less digits than its factorization.

8427277421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4842222.

The product of its digits is 351232, while the sum is 44.

The square root of 8427277421 is about 91800.2038178565. The cubic root of 8427277421 is about 2034.9907068941.

The spelling of 8427277421 in words is "eight billion, four hundred twenty-seven million, two hundred seventy-seven thousand, four hundred twenty-one".