243021023 has 4 divisors (see below), whose sum is σ = 277738320. Its totient is φ = 208303728.

The previous prime is 243021017. The next prime is 243021029. The reversal of 243021023 is 320120342.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 320120342 = 2 ⋅160060171.

It is an interprime number because it is at equal distance from previous prime (243021017) and next prime (243021029).

It is a cyclic number.

It is not a de Polignac number, because 243021023 - 2⁴ = 243021007 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 243020992 and 243021010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243021029) 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, 17358638 + ... + 17358651.

It is an arithmetic number, because the mean of its divisors is an integer number (69434580).

Almost surely, 2^243021023 is an apocalyptic number.

243021023 is a deficient number, since it is larger than the sum of its proper divisors (34717297).

243021023 is an equidigital number, since it uses as much as digits as its factorization.

243021023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34717296.

The product of its (nonzero) digits is 288, while the sum is 17.

The square root of 243021023 is about 15589.1315665755. The cubic root of 243021023 is about 624.0431421177.

Adding to 243021023 its reverse (320120342), we get a palindrome (563141365).

The spelling of 243021023 in words is "two hundred forty-three million, twenty-one thousand, twenty-three".