243001221 has 8 divisors (see below), whose sum is σ = 326974560. Its totient is φ = 160514352.

The previous prime is 243001211. The next prime is 243001223. The reversal of 243001221 is 122100342.

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

It is not a de Polignac number, because 243001221 - 2¹³ = 242993029 is a prime.

243001221 is a modest number, since divided by 1221 gives 243 as remainder.

It is a self number, because there is not a number n which added to its sum of digits gives 243001221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243001223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 371235 + ... + 371888.

It is an arithmetic number, because the mean of its divisors is an integer number (40871820).

Almost surely, 2^243001221 is an apocalyptic number.

It is an amenable number.

243001221 is a deficient number, since it is larger than the sum of its proper divisors (83973339).

243001221 is a wasteful number, since it uses less digits than its factorization.

243001221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 743235.

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 243001221 is about 15588.4964316640. The cubic root of 243001221 is about 624.0261920917.

Adding to 243001221 its reverse (122100342), we get a palindrome (365101563).

The spelling of 243001221 in words is "two hundred forty-three million, one thousand, two hundred twenty-one".