243021401 has 4 divisors (see below), whose sum is σ = 277738752. Its totient is φ = 208304052.

The previous prime is 243021397. The next prime is 243021403. The reversal of 243021401 is 104120342.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 243021401 - 2² = 243021397 is a prime.

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 243021401.

It is not an unprimeable number, because it can be changed into a prime (243021403) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17358665 + ... + 17358678.

It is an arithmetic number, because the mean of its divisors is an integer number (69434688).

Almost surely, 2^243021401 is an apocalyptic number.

It is an amenable number.

243021401 is a deficient number, since it is larger than the sum of its proper divisors (34717351).

243021401 is an equidigital number, since it uses as much as digits as its factorization.

243021401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34717350.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 243021401 is about 15589.1436904020. The cubic root of 243021401 is about 624.0434656675.

Adding to 243021401 its reverse (104120342), we get a palindrome (347141743).

The spelling of 243021401 in words is "two hundred forty-three million, twenty-one thousand, four hundred one".