243354021 has 4 divisors (see below), whose sum is σ = 324472032. Its totient is φ = 162236012.

The previous prime is 243354019. The next prime is 243354029. The reversal of 243354021 is 120453342.

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 243354021 - 2¹ = 243354019 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 243353982 and 243354000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243354029) 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, 40559001 + ... + 40559006.

It is an arithmetic number, because the mean of its divisors is an integer number (81118008).

Almost surely, 2^243354021 is an apocalyptic number.

It is an amenable number.

243354021 is a deficient number, since it is larger than the sum of its proper divisors (81118011).

243354021 is an equidigital number, since it uses as much as digits as its factorization.

243354021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81118010.

The product of its (nonzero) digits is 2880, while the sum is 24.

The square root of 243354021 is about 15599.8083642076. The cubic root of 243354021 is about 624.3280424024.

The spelling of 243354021 in words is "two hundred forty-three million, three hundred fifty-four thousand, twenty-one".