243133021 has 8 divisors (see below), whose sum is σ = 248540544. Its totient is φ = 237735360.

The previous prime is 243133003. The next prime is 243133049. The reversal of 243133021 is 120331342.

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 243133021 - 2⁹ = 243132509 is a prime.

It is a super-2 number, since 2×243133021² = 118227331801172882, 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 243133021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243133421) 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 7 ways as a sum of consecutive naturals, for example, 71326 + ... + 74656.

It is an arithmetic number, because the mean of its divisors is an integer number (31067568).

Almost surely, 2^243133021 is an apocalyptic number.

It is an amenable number.

243133021 is a deficient number, since it is larger than the sum of its proper divisors (5407523).

243133021 is a wasteful number, since it uses less digits than its factorization.

243133021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4931.

The product of its (nonzero) digits is 432, while the sum is 19.

The square root of 243133021 is about 15592.7233349406. The cubic root of 243133021 is about 624.1389923299.

Adding to 243133021 its reverse (120331342), we get a palindrome (363464363).

The spelling of 243133021 in words is "two hundred forty-three million, one hundred thirty-three thousand, twenty-one".