21120000243 has 4 divisors (see below), whose sum is σ = 28160000328. Its totient is φ = 14080000160.

The previous prime is 21120000227. The next prime is 21120000287. The reversal of 21120000243 is 34200002112.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21120000243 - 2⁴ = 21120000227 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21120005243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3520000038 + ... + 3520000043.

It is an arithmetic number, because the mean of its divisors is an integer number (7040000082).

Almost surely, 2^21120000243 is an apocalyptic number.

21120000243 is a deficient number, since it is larger than the sum of its proper divisors (7040000085).

21120000243 is an equidigital number, since it uses as much as digits as its factorization.

21120000243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7040000084.

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

Adding to 21120000243 its reverse (34200002112), we get a palindrome (55320002355).

The spelling of 21120000243 in words is "twenty-one billion, one hundred twenty million, two hundred forty-three", and thus it is an aban number.