8241221428 has 18 divisors (see below), whose sum is σ = 15852433058. Its totient is φ = 3746009520.

The previous prime is 8241221423. The next prime is 8241221447.

8241221428 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in only one way, i.e., 8021351844 + 219869584 = 89562^2 + 14828^2 .

It is a junction number, because it is equal to n+sod(n) for n = 8241221393 and 8241221402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8241221423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8513175 + ... + 8514142.

Almost surely, 2^8241221428 is an apocalyptic number.

It is an amenable number.

8241221428 is a deficient number, since it is larger than the sum of its proper divisors (7611211630).

8241221428 is a wasteful number, since it uses less digits than its factorization.

8241221428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17027343 (or 17027330 counting only the distinct ones).

The product of its digits is 16384, while the sum is 34.

The square root of 8241221428 is about 90781.1733125322. The cubic root of 8241221428 is about 2019.9030626945.

The spelling of 8241221428 in words is "eight billion, two hundred forty-one million, two hundred twenty-one thousand, four hundred twenty-eight".