4243220521 has 8 divisors (see below), whose sum is σ = 4491622080. Its totient is φ = 4001624592.

The previous prime is 4243220507. The next prime is 4243220533. The reversal of 4243220521 is 1250223424.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 4243220521 - 2¹⁹ = 4242696233 is a prime.

It is a super-2 number, since 2×4243220521² = 36009840779671022882, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (4243220321) 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 7 ways as a sum of consecutive naturals, for example, 1700125 + ... + 1702618.

It is an arithmetic number, because the mean of its divisors is an integer number (561452760).

Almost surely, 2^4243220521 is an apocalyptic number.

It is an amenable number.

4243220521 is a deficient number, since it is larger than the sum of its proper divisors (248401559).

4243220521 is a wasteful number, since it uses less digits than its factorization.

4243220521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3402815.

The product of its (nonzero) digits is 3840, while the sum is 25.

The square root of 4243220521 is about 65140.0070693886. The cubic root of 4243220521 is about 1618.9441528457.

Adding to 4243220521 its reverse (1250223424), we get a palindrome (5493443945).

The spelling of 4243220521 in words is "four billion, two hundred forty-three million, two hundred twenty thousand, five hundred twenty-one".