243552421 has 16 divisors (see below), whose sum is σ = 295591680. Its totient is φ = 195897600.

The previous prime is 243552401. The next prime is 243552427. The reversal of 243552421 is 124255342.

It is a cyclic number.

It is not a de Polignac number, because 243552421 - 2¹⁷ = 243421349 is a prime.

It is a super-2 number, since 2×243552421² = 118635563549922482, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 243552421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243552427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 39871 + ... + 45571.

It is an arithmetic number, because the mean of its divisors is an integer number (18474480).

Almost surely, 2^243552421 is an apocalyptic number.

It is an amenable number.

243552421 is a deficient number, since it is larger than the sum of its proper divisors (52039259).

243552421 is a wasteful number, since it uses less digits than its factorization.

243552421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6084.

The product of its digits is 9600, while the sum is 28.

The square root of 243552421 is about 15606.1661211202. The cubic root of 243552421 is about 624.4976622791.

It can be divided in two parts, 24 and 3552421, that added together give a triangular number (3552445 = T₂₆₆₅).

The spelling of 243552421 in words is "two hundred forty-three million, five hundred fifty-two thousand, four hundred twenty-one".