3831421221 has 6 divisors (see below), whose sum is σ = 5534275110. Its totient is φ = 2554280808.

The previous prime is 3831421219. The next prime is 3831421261. The reversal of 3831421221 is 1221241383.

It can be written as a sum of positive squares in only one way, i.e., 3771188100 + 60233121 = 61410^2 + 7761^2 .

It is not a de Polignac number, because 3831421221 - 2¹ = 3831421219 is a prime.

It is a super-3 number, since 3×3831421221³ (a number of 30 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3831421261) 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 5 ways as a sum of consecutive naturals, for example, 212856726 + ... + 212856743.

It is an arithmetic number, because the mean of its divisors is an integer number (922379185).

Almost surely, 2^3831421221 is an apocalyptic number.

It is an amenable number.

3831421221 is a deficient number, since it is larger than the sum of its proper divisors (1702853889).

3831421221 is a wasteful number, since it uses less digits than its factorization.

3831421221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 425713475 (or 425713472 counting only the distinct ones).

The product of its digits is 2304, while the sum is 27.

The square root of 3831421221 is about 61898.4751104581. The cubic root of 3831421221 is about 1564.7800486376.

The spelling of 3831421221 in words is "three billion, eight hundred thirty-one million, four hundred twenty-one thousand, two hundred twenty-one".