4271849821 has 4 divisors (see below), whose sum is σ = 4271989212. Its totient is φ = 4271710432.

The previous prime is 4271849801. The next prime is 4271849831. The reversal of 4271849821 is 1289481724.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 408605796 + 3863244025 = 20214^2 + 62155^2 .

It is a cyclic number.

It is not a de Polignac number, because 4271849821 - 2⁵ = 4271849789 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 (4271849801) 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, 1450 + ... + 92443.

It is an arithmetic number, because the mean of its divisors is an integer number (1067997303).

Almost surely, 2^4271849821 is an apocalyptic number.

It is an amenable number.

4271849821 is a deficient number, since it is larger than the sum of its proper divisors (139391).

4271849821 is an equidigital number, since it uses as much as digits as its factorization.

4271849821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139390.

The product of its digits is 258048, while the sum is 46.

The square root of 4271849821 is about 65359.3896926830. The cubic root of 4271849821 is about 1622.5770370425.

The spelling of 4271849821 in words is "four billion, two hundred seventy-one million, eight hundred forty-nine thousand, eight hundred twenty-one".