243023330756021 has 4 divisors (see below), whose sum is σ = 243023372401152. Its totient is φ = 243023289110892.

The previous prime is 243023330755999. The next prime is 243023330756039. The reversal of 243023330756021 is 120657033320342.

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 243023330756021 - 2¹⁸ = 243023330493877 is a prime.

It is a super-2 number, since 2×243023330756021² (a number of 30 digits) 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 243023330756021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243023330776021) 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, 10295015 + ... + 24331748.

It is an arithmetic number, because the mean of its divisors is an integer number (60755843100288).

Almost surely, 2^{243023330756021} is an apocalyptic number.

It is an amenable number.

243023330756021 is a deficient number, since it is larger than the sum of its proper divisors (41645131).

243023330756021 is an equidigital number, since it uses as much as digits as its factorization.

243023330756021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41645130.

The product of its (nonzero) digits is 544320, while the sum is 41.

The spelling of 243023330756021 in words is "two hundred forty-three trillion, twenty-three billion, three hundred thirty million, seven hundred fifty-six thousand, twenty-one".